As Pwent reaches for the knob in front of the party and turns it, the door cracks open. Additionally, the floor gives way on a set of hinges between Bahruul and Destiny. Pwent barely manages to keep hold of the doorknob, but as the door cracks open he is able to dangle above the trap by having a firm grip on the doorknob.
Pwent:
[Sblock]Pwent will be able to scramble up to the other side, but he will be on the opposite side of the pitas the rest of the party. The door will remain open if Pwent desires.[/Sblock]
Bahruul is not so fortunate. As the floor gives way, his ability to react is delayed and he drops to the floor of the pit. His sword slips out of his hand as he plummets and prepares to brace himself for the fall. Thankfully, Bahruul does not meet up with any spikes at the bottom of the pit - and his sword lands several feet away, undamaged from the impact with the stone floor. However, thirty feet down is a long way for the Bous to fall.
Bahruul:
[Sblock]The fall does 3d6 falling damage = 8. You got lucky!

[/Sblock]
Keryth, Byntrou:
[Sblock]Underneath Keryth's and Byntrou's feet (and Destiny's, but she's an NPC

) a slight rumbling can be felt. It almost feels as though something is turning continuously - and it has only been occurring since the pit was completely open.[/Sblock]
Map:
[Sblock]
Code:
------------------/-|
bKDXXP
--------------------|
XX = Squares opening into the pit, Bahruul is 30 feet down into this pit.[/Sblock]