"Hah! Ruined his day for him? Good." It's said with feeling. "That one's never going to have any reason for a good mood that's healthy for anyone else. --Has he started trotting after you like he does Enjolras, or did you take it on yourself to ruin his day?" It's not like Feuilly to try and ruin someone's mood, but then Feuilly's been branching out into all sorts of new endeavours.

Also, it's Javert. The man could inspire a songbird to go for his eyes.