Disturbed Floor Room
Wow, I rolled you the best score you could possibly get. Why cant I do that for my characters?

Ceiling is at about 8 feet high.
Taking the time to utilize not only his thieving skills, but his lifetime of dwarven instincts, Grimm realizes the gist of this situation long before the others can sort it out.
He deduces that the irregular floor in the room above is actually the trigger point for this trapped hallway below, guessing there is a pressure plate or something similar directly under the uneven ceiling down this 20' narrow hallway.
Actions?
Amun (F3) AC:2 17/33
Crabbe Luther AC:4 15/30
Chauncey (MU5) AC:3 30/30 RM, CL, DM 1/4 1st 1/2 2nd 1/1 3rd
Elnaerel (C4) AC:3 19/30 0/5 1st 4/4 2nd
Waesfaren (D6) AC:7 53/53 5/6 1st 3/5 2nd 2/3 3rd 1/1 4th PfF:0 Bullseye Lantern
Grimm AC:5 20/20