Ben snuffs the torch with prestidigitate and curses before saying,

"Hey, Grix. Come help me relight this. I can't see fork."

He moves on square east and tries to have the hob help him from the square southeast if it isn't too suspicious.

(So he can't see west or southwest well.)

((Ah, sorry I was focused on the 'you don't see it' and then I did see it part.))

((ah perfect! thank you and yes please always keep me honest in movement stuff!))

((I was less worried about you being honest, and more about making sure I hadn't goofed! I'm used to having the roll20 movement tools from the other side of the DM screen, which I use the 5-10-5 by default, though diagonals in small scale like this don't really matter as much, it's large open battlefields where diagonal moves can be otherwise exploited.))

Ben, you snuff the torch and ask Grix for help. 

Grix does indeed come up a bit, although not to the square you mentioned, to see what is going on. "Huh? What you do?? Go light torch with other torch. Still smell. HUMPH." and Grix points to the other torch suggesting you just go and light it with the other one and crosses his arms. 

The other hobgoblin near the water does not move. 

The woman and boss continue to laugh and talk about farts.

Ash is up, and then Korrik.

Korrik will need a stealth check to get across like the others did. It will be with advantage again, and the DC will be even lower than the -5 on the hobgoblin's passive perception because he doesn't have full view with Ben standing there, and the cave wall in the way. I see Korrik has +5 to stealth, so basically you can consider the attempt a pass as long as you don't roll snake-eyes on the check.

(I forgot about his halfling powers... anyways, if you hit that snake eyes roll we have to make it a fail :) )

((Would it require his action to make that check? Or does he still have it to use?))

 Stealth: 16
Advantage  Stealth: 8

(no action required, that's also an added advantage to this highly unlikely scenario where the Hob would see you. Nice rolls!)

Korrik darts across and tucks up in the south chamber, calling forth a 5ft diameter boulder that blocks the passage, but is out of sight of the hob that he spotted on the other side of Ben. He flashes a thumbs up towards the south end of the chamber where Ess and Ash should be waiting, if all has gone to plan.

Ash holds position again, listening, sniffing (eww!), and waiting...

While she’s waiting she will probably load her sling and hold it in one hand, then draw a dagger to hold in the other hand.

((She’ll probably wait until she can hear skeletons, and even then probably wait further until she can hear fighting or some kind of commotion (or a party member in trouble). For now she holds, and helps Ess to stay patient if need be)).

Ash holds her position, prepping her weapons and waiting, listening...

Korrik, you move and create the illusion without any issues. You would see Ash but not Ess, but assume all is going as planned. 

All of the skeletons including the newest addition move forward, some dashing forward faster than others, but all of them following the halfling that they were chasing and now going through the door. They are clicking and clacking and hissing. The closest skeleton would actually see Billard at the last millisecond of its turn, so it does not get the chance to perhaps hiss louder. The hobgoblin is mere moments away from hearing them, but at this point does not nor does he see them. 

Next Round: Men, Ess, Busren, Hobs, Women, Baldy, Ash, Korrik, Skeletons

The men move 5ft each.

Ess also continues to wait, and when he sees Ash prep her weapons, he looks down at his longsword and also reaches to feel for his longbow. He's ready to whip out whatever is needed.

Busren is up. So, you have now heard the skeletons and seen a flash of one in the corner of your eye. Grix has told you to go light the torch with the other torch. He's waiting for you to do that now. He doesn't see or hear the skeletons, but is about to. You see and hear the first one.

GO!

Map is updated. 

"Fine, stink up the cave and act like a spoon."

Billard walks past on his way to the other torch. On reaching the other torch he instead snuffs it and says,

"What the spoon?"

Ben, you walk over to the torch and snuff it!

Grix growls a bit in annoyance. "aaarrggghhhhhhrrrrrwhhaaaatt you DOING?" and he starts to follow and walk over to see what is going on. "Happen what??? Why no fire? What you do?"

The other hob doesn't move. 

The woman and the boss would see the torch go out. They'd stop their laughter and the woman would start to walk over, but she doesn't get far because she didn't notice the light go out until late in her turn. And isn't super interested. The boss would just remain where he is. 

Ash is up, and then Korrik. 

The map has been updated.

Billard shrugs,

"Dunno. Just went out like the other one? Your gas put'm both out maybe?"

((The torches in the map accurate? Just a couple left?))

((Just Baldy's and the one towards the boat left?))

Ash continues to wait and listen, and urge Ess silently (with gestures only, if needed) to wait too...

((correct about the torches. I will update the map accordingly with black circles over the flames on the next map update.))

Ash turn queued - Korrik is up

Korrik debates moving to join Ash and Ess, but holds position for now.

((Readied dash for if anything breaches his illusion.))

Ash continues to wait, gesturing to Ess as Korrik also hold position. 

The skeletons move forward into the cavern, and the other ones move closer as well. They are hissing and clicking and clacking, making a good bit of noise at this point. Korrik, you can see them coming in!

Next Round: Men, Ess, Busren, Hobs, Women, Baldy, Ash, Korrik, Skeletons

The men do not move, they do not notice anything at this moment. 

Ess listens to Ash as he holds his position, ready to get his sword or bow out.

Ben is up! You can hear and see the skeletons coming. (you could assume that the hobgoblin will too).

Map is updated.