Renard and Carl move first, the fox-man's arrow injuring the lead rat as Carl's rapier sails over it, but misses. Thym's blast rips into the creature before it can bite at Carl, killing it.
The next two rats rush forward, one biting Carl (-4 hit points to Carl) along the arm, leaving a slight swelling where the wound was inflicted. Guy moves on in, his rapier critically injuring a rat, but his short sword failing to connect and finish it. Samuel ends its life with a sling bullet, however.
Thorg's shadow causes the final rat to cringe before his heavy mace comes crashing down, upon its skull with a splattering of blood.
In the room behind the rats is a square room with each wall being 20 feet long. The door is in the center of the southern 10 feet of the east wall. In the center of the south wall of the room is a lever. The lever has two positions; up and down. The down position is unmarked. The position is marked "A". The lever is pushed down.