You proceed down the hall, cautiously and alert. The hallway continues for another fifty feet before opening up into a slightly larger chamber. The ceiling here is twice as high as the hallway. The room is about thirty feet square. Across the way you can, at the edge of the torchlight, make out a closed wood door. The bottom third of the door appears to have bene hacked away creating a small opening. Instinctively, you look up, and sure enough the torchlight falls on hundreds of bats, now stirring to life at the sudden illumination. Amongst the smaller bats are a couple of abnormally large bats. They screech and drop from the ceiling, aggressively flying in your direction.
The procedure here is fairly simple. Include at the end of your post an explicit statement of your actions. I won't be using a map. As things stand the bats are still near the ceiling and so are out of melee range (until they act). The room is large enough to get around without worry about opportunity attacks (until the bats descend).
Combat - Initiative Order
Rurik
Giant Bats (2)
Zaris
Kaiakas
Corban
Reina
Bat Swarms (2)