Skip reels from his wounds, but feels the healing power from Rudicks words take effect. 
initiative 20
seeing Rudick engage the beast, Skip feels his pulse race in fear, he knows he can’t take another hit like those, but he strikes out again at their foe with both blades, then dances back out of range

Attack rapier 14
damage 12
sneak attack of Rudick is in range 6
off hand attack 11
damage 6
bonus action: disengage

moves back 25ft

((Before I close this round, could everyone tell me their positions? I know that Rudick and Leann are in the top left corner of the map with the vampire.))

Skip moves 25ft away, along the back wall

Alev would be on the back, near the way to the door, trying to put some distance between the vampire and himself.

Vampire Spawn Initiative: 20

Initiative ties, so the party goes first.

After ripping into the hafling, Skip desperately launches a counterattack against the undead horror. It bats away your strikes and opens its mouth wide to sink its fangs into Skip as he backpedals to escape when Rudick's hammer smashes into its mouth. It stumbles backwards dazed  and hisses in pain when LeAnn leaps towards and attempts to slash at the creature, but even in its dazed state, its reflexes make it dodge the attack. As magical energy washes over Skip and seals his wounds, Sergei launches a torrent of dark power at the vampire that slams into the wall behind it. Determined to help his allies, Skip sends three gouts of blazing fire through the air. The vampire nimbly ducks out the way of one of the bolts. The second one actually ricochets off of its stony skin and strikes the ground near it while the third blasts into its thigh.

Despite its wounds, you watch as the damage you inflicted upon it close and fade away like nothing happened to it. With a bout of high-pitched, maniacal laughter as leaps upwards and lands on the ceiling like a monstrous spider. Still laughing, it scurried along the ceiling on hands and knees towards the exit. It climbs up through the hole and disappears from sight. It couldn't have gone far yet.

((It provokes AoO from Leann and Rudick as it escapes.))

oops sergei initiative, if still relevant, 10

Sergei is on the stairs, as high as possible while still being able to attack

On Sergei's turn, he will attempt to follow the monster and fire at it with another agonizing blast. If it is trying to flee he will follow as much as possible. If it's going to stop to attack him then he will attempt as much as possible to keep his distance.

Attack: 14 Damage: 9

"...What's with these monsters and not burning down in flames like they should?" Alev asks to himself.

He joins Sergei in trying to follow after the vampire. If the vampire went outside, he will take flight as soon as he's out of the church, trying to see where he went from above.

Perception: 13

Reaction: (AoO)Dropping the Hammer.
(Lethal, One-Handed)Warhammer - Attack: 8 Damage: 11 magical bludgeoning.

Rudick takes a swing at the retreating creature's legs at it made its surprising bound. But whether it connects or not, Rudick swung without expectations of it being enough. Not after it seeing it regenerate at least from the obvious damage done. So it was without hesitation that he quickly barked an "After it!" as he gave chase after the creature.

Movement/Action: To move 60ft after the creature and up the stairs(if possible).

Leann's attack of opportunity:

To hit: 9 Damage: 9

As it escapes, both Leann and Rudick try to wound it once more, but both of their attacks just glide through empty air. The vampire spawn is surprisingly quick and agile. 

((It used its action and turn to move, so it is currently at the door to the church. Rudick is currently next to it. If Alev and Sergei climb out from the trapdoor, they are at a good enough angle to attack the vampire with their spells. Just waiting on Skip and Leann to take their next turn. Alev can also do something else besides doing a Perception check if you want. The vampire wasn't trying to hide.

I'm going to try out some different combat formats in the future to help make things a bit easier to understand. Sorry about the confusion.))

Skip sheathes his blades and draws his Shortbow, heading for the trapdoor. 

((Sorry, got confused by the "disappears from sight" line. Action taken on that post remains mostly the same: Alev flew to chase after the vampire, so he's at the trapdoor now.))

Seeing as the vampire seemed like he was trying to get away, Alev would try to cast Chill Touch on him, if only to have that spectral hand try to grab him. It wasn't going to do much, but it might help hurt him.

Attack: 13 Damage: 7

Leann swears colorfully, then rushes up and out after the vampire. As soon as she comes into sight of it she casts suggestion

DC 14 Wis save or the target has to follow the course of action she specifies...

"The basement of this church needs cleaning, please return and clean it."

(Not sure if vampires are immune to charm, or how good of Wis saves they have, but this was her only real shot of keeping it from getting away, at least on her action,.)

If the vampire is still in range by the time Skip gets him in site, he will fire his bow range 80/320

attack shortbow 16
attack disadvantage of long range 11
damage 5

Wisdom Saving Throw: 11

Both Sergei and Alev girl their magic at the vampire, but it spins out of the way even with its back turned to you. As it throws open the doors, it freezes for a moment as Leann's magic washes over it. With a snarl, it wrests free of your control and sprints off into the fog the suddenly fills the air with its moist tendrils. Skip futily fires an arrow that sails through the thick mist.

The vampire spawn has escaped.

"I am so stupid." Leann says as she kicks the wall in frustration. "Should have made sure the door was either shut or blocked it myself, rather than give it the chance to flee..."

"What do we do now?" Alev groans in frustration. "I doubt the priest is going to like it when we tell him we left his 'son' get away..."

If the mist allows it, he will go out to try and track him down.

Sergei is not above floating the idea of just not mentioning this to the father.

"We don't lie to him, not exactly, we just don't mention it... I can handle the talking if it comes up."