[The ringing in Lance's ear is beginning to fade a little, indicating he probably didn't blow the eardrum, which is always a good thing. So although his hearing still isn't good enough to catch the sounds of more rats, he can catch both what Ian says and, more importantly, the tone.

So he turns away from the injured man and the scientist who's helping, the latter taking over the bandages, and he gets to his feet to rejoin Ian. Now, turned the right way, he can hear the motion, and he glances over at Ian.]

As soon as they all come into this tunnel I'm going to surprise them, and then we're all going to run. Do you think you could collapse the ceiling behind us?