"By Auril's frosty ti... breasts, what have you done now?!" Carrach roars.
"Quick, everyone out of here and into one of chambers either left or right!
What ever that is, we've no idea how is circulated, so be ready to duck into the tunnels, if necessary!"
Carrach moves backwards (still keeping a healthy distance to the pit) and waits for his companions to leave to room. Meanwhile he'll watch the gas-cloud, always ready to move out of the way should it drift or even being blown into the hallway.
(OoC: I'm a bit confused. On which door Sando did try the key, east or west?)