And looking back, it seems unlikely that it would have fallen to that single spell. So it was Troll 1 that fell? In which case, Mola's attack has me confused.

Rixton smirks at the Troll's threat. "Oh? Which one is that?" he says in relatively fluent Giant.

Wasting no ore breath on words, he charges in again, slicing at the troll with his hand axe again. He then disengages again and returns to his position.

Hand axe Attack: 27 Damage: 10

Rixton's axe cuts a gash across the troll's massive arm. As it pushes its way through the stable wall, the giant mutters, "Nevermind your horse. You then!"

The stable wall is considered difficult terrain; therefore, Rixton remains out of the troll's reach.

Renna, trying to grasp what has happened in the last thirty seconds, stares at the fallen troll momentarily before heading toward the stable.

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All characters may act, in any order. Updated map:

"I'll make you a deal," Rixton says. "You can eat me but then you can only eat vegetables for the rest of your life." Rixton, unarmored and alone, the rogue considers stalling the Troll here but instead takes another swipe, disengages again, and falls back to F13. 

Hand axe Attack: 10 Damage: 9

Seeing Troll #1 fall at the claws of Molabear, Gwin rushes into the stables (dash to F16) where she knows Rixton is alone with Troll #2. She immediately casts a sanctuary spell over the monk to protect him from any attack.

Bonus action: Sanctuary

Jheric Dashes into the stable, making sure to gently nudge his final, fiery satellite away from any wooden framing.

Molabear roars in triumph as the vile troll falls to his claws.

Mola hears another troll. Mola still doesn't like trolls. Mola runs. Mola runs fast. Mola dashes into the stable. 

I think he can make it to F13 with his 40 feet (x2 for dash) of movement, not sure if he makes it there before Rixton or not. But he's trying to get between the others and the troll. I'm new to barbarians but I think unless he gets attacked this turn he loses his rage. He's doing his best to draw attention, ending his dash up on his hind legs.

The troll charges after Rixton, who is able once again to stay out of the monster's reach. As it strides down the center of the stable, the troll extends its arms, allowing its claws to carve deep gashes in the walls on either side. The noise and commotion has the horses in a complete panic. The fact that Rixton now stands near a bear does nothing to dissuade the monster's intent...

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All characters may act, in any order. Converted the map to 5' squares and did my best to adjust each character's position accordingly.

Gwin is still shaken from the attack of the dead troll. She can feel her clothing begin to saturate with blood from her wounds. She places her left hand on the interior wall of the stable to to steady herself, but seeing the second troll moving toward her companions (and even more so, her horse), she readies for another attack. More accustomed to healing and rituals, her arsenal isn't as well equipped for fighting trolls, but having had success with her previous spell, she engages it once more. 

Guiding Bolt: Attack: 23 If successful, radiant damage: 14

I believe Mola lost rage last turn because he was not attacked and he did not attack. But I think he can rage again as a bonus action while wildshaped, so he will do that this turn.

Molabear, not quite as tall as the giant troll, but almost so on his hind legs, pauses for a brief second to contemplate his existence. In a barn. As a bear. Fighting a troll. By an inn. On a mission. Surrounded by horses. Feeling no fear. Supported by strangers. Life is. As it should be. But it is not. There is still a troll. Trying to eat people. This will not stand. Molabear rages again. Molabear attacks again.

Attack: 21 Damage: 8
Attack: 8 Damage: 15

(Let me know if he gets advantage from an owl flyby and I can roll again.)

 Gwin's use of Guiding Bolt grants advantage to the next attack made against the troll. So, rkmobius may roll again for Mola's first attack.

Rixton throws his hand axe (I know, he is in range to slash with it but only the thrown property on it gives him sneak attack damage) at the troll while it is distracted by Molabear.

Hand axe Attack: 28 Damage: 27

He follows this with a calculated palm strike to the troll's chin.

Bonus action:

Unarmed Attack: 21 Damage: 7

Jheric rushes down the central alley of the stables, twisting and turning his hands over each other several times before holding a outstretched hand. A trio of blue darts streak forth and strike the troll in the chest.

([spell]Magic Missile[spell]: 5+2+2 Force damage)

With the odds so clearly in their favor, Jheric is confident of a quick demise to follow. He waves once more and his final arcane meteor streaks forth, its blast shielded from reaching allies and surrounding structures.

(Final meteor sent for 10 fire damage. I can block damage for up to 4 potentially affected squares)

Chasing Rixton through the stables proves to be the troll's last bad decision. Half-stunned by Gwin's bolt, the troll is open season for the claws and teeth of Mola-as-a-bear. As it prepares to retaliate the troll feels the sting of Rixton's axe and a smash to the chin. The rage in the troll's eyes turns to confusion and then, for the slightest of moments, to fear. Its fear, however, is quickly extinguished as the force and fire from Jheric's spells bring the troll smashing to ground. 

Rixton pats Knickerboxer on his rump, then runs his hand along the horse to help soothe the beast. "Easy, boy," he says. "Yes, that was exciting but everything is all well now. Perhaps we should encounter more trolls to get you used to their sounds and smells, eh?"

Jheric Observes the smoldering troll body from a safe distance, ensuring it is truly dead and not just recovering. Satisfied, he steps outside to inspect the other. Finally, he taps Renna on the shoulder and offers, "You may want to get axes and cleavers out here quickly with oil and fire. The sooner you can burn them, the sooner you can be certain they are done."

Renna nods in agreement with Jheric's plan, and within a quarter of an hour, Tamalin--the proprietor of the inn--has commandeered the local deputies to clean up the mess. Roughly one hundred yards from the stables a troll-fueled bonfire lights up the night sky.

"Well, the friends of Renna just happened through our corner of the world on just the right night," Tamalin says to the four of you. She places a special emphasis on the word friends as if to indicate she recognizes you might be more than some acquaintances from her employee's past.

She continues with a wry smile. "My only complaint is that you robbed my deputies of earnin' their keep. Eat a hearty breakfast in the mornin', friends. Your rooms, meals, and drinks are on the house."

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The remainder of the night passes without incident, and, as promised, Tamalin makes sure the cook provides you with as much as you can eat. As you make your way to the stables, you see a thin, gray column of smoke in the distance, the last remnant of last night's bonfire. The horses and Tarnie behave as if nothing had ever happened and seem eager to go wherever it is you might lead them.

 Map, highlighting Renna's directions to the Tribe of the Hand (if that's the next step):

As she sees the second troll fall, Gwin rushes into Steveaustin's stall and checks on him. Between the thunder and rain of their travels and now the mighty troll take down he's understandably agitated, but after a few calming words and some sugar cubes he settles in for the night.

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Gwin sleeps soundly through the night, so weary that even her snores sound halfhearted. She's grateful for the belly full of food Tamalin's cook provides and she thanks both enthusiastically. Bidding Renna farewell, she takes the bar maid's hand in her own and says I do SO hope we meet again, under less dire circumstances. You know what they say, make new friends, but keep the old. One is silver and the other is mold.

Gathering her cloak about her, she steps out into the morning light and makes her way to the stables, eager to get one day closer to solving the mystery of the Pikes.

After the troll falls, Molabear's rage dissipates slowly -- the bear wheels around and stomps over to the troll outside, picking it up like a rag doll and shaking it around. Eventually he realizes that the battle's over, though he gets a good scent off the trolls and then tries to follow the trail for a bit using his keen smell, to try to get a sense of where the trolls came from, and if they dropped anything along the way or interacted with anyone/anything on their way in. Perception: 19

He returns and sits down on his rump in front of Renna and Tamalin as the bonfire's starting up, and as she mentions food, he shifts back into his human form. He eagerly accepts the offer, and the next morning, he eats three breakfasts with gusto. He asks his companions and Renna, between bites, "should we circle into the Evermoors on our way out to check out the battlefield where our quarry, the Tree Ghosts, and the Hand all fought? Might be something there that is relevant to our hunt. Renna, you said it was no more that an hour's walk from here, perhaps you could guide us? Probably nothing, but if it's not too far out of the way, it might be helpful to see what attracted their attention for an ambush in the first place. Then we can move along to Olostin's Hold. Just an idea."

When Rixton comes down for breakfast, he looks like he slept under the bed instead of on it. Between his tea and eggs, which he does not savor in the least, he rambles about a rather insane sounding theory about the connection between divine magic and bardic magic that somehow involves dwarven mining practices and their relevance to halfling instrument making.

When Mola interjects with his question, or rather when Rixton pauses enough to hear the conversation everyone is having aside from his monologue, he says, "A small detour for more information sounds like a good idea, if it doesn't delay us too much."

For the rest of the meal, Rixton keeps his thoughts to himself though his mind clearly continues to whir.