[The choice of word is surprising to her, too -- even like this, she'd have thought he'd pronounce it repulsive, what she's doing, the casual disregard for human life she's showing. Instead, what she gets is almost like... concern.]
How? [The surprise, even the touched edge to it, doesn't mean she'd concede the point, especially as she sees no need to hide what she's doing, right now.]
There is no one else here. Everyone is celebrating... and even if someone would happen to pass by, what then? Why should I hide this?