Hi there, does the use of "cut slack" sound okay to you in my scenario in which a vigilante promised to avenge a girl's raper, but now somehow they had the police attention on them:
This sounds fine to me, yet not very sure.Girl: This has to be done, you know it!
Vigilante: Yes, we'll kill him, as I promised you that. But you see the things aren't going the way we planned. I'm afraid we have to cut him some slack, for now.