[I just got super distracted looking up pinstripe suits with cleavage windows and the answer is there are none. Anyway, she's gonna slap him. Just plain slap him.]

If you don't settle the hell down, I'm going to leave you down here. You're being much bitchier than usual -- [She stops talking because there's something weird ahead, some abrupt change in the tunnel's infrastructure, and she cautiously slows her pace.] Is that a cave-in...?