Florrie + Remus
We're talking here about Death Eaters, I presume. Seeing something they did or actually being tortured? I mean honestly a lot of us have some trauma to work out from coming on the scene and seeing what was done. Finding bodies. That sort of thing. I can talk about personal experience from that, and some of the informal advice I've had.
It's more tricky if the person has been a direct victim.