[Meanwhile, the wheels are turning in Bruce's head. If this has something to do with prom night . . .

And suddenly, Bruce is wondering about Ema. Well, there were plenty of women back home who were attracted to the "bad-boy" types of men, so it really shouldn't be all that surprising. Still, curiosity does get the better of him, and--]

Are you two, ah . . . ? [He pauses.] Pardon me. None of my business.

[No need to make things more awkward than they already were. Right now, he's wishing he had his costume and that someone would conveniently rob a bank or something, so he could make a ninja exit.]