He should leave, perhaps. Nimona's fight with Efrain was quite spectacular, and his glass creatures played no small part in the battle. A number of people might be quite annoyed with him by now...but somehow, Pyotr can't really bring himself to care.

He must have stripped out too much fear, or perhaps he left behind too much of his depression and its attendant, his deathwish? Reason tells him that he's likely to get jumped by a belligerent drunk if he hangs around the party too long...but it also points out that if he feels guilty or bitter later, he now has a productive use for those emotions.

Maybe he'll stick around for a little while. Just to see how the party's mood develops.