I fully intended to ignore it and would not have brought it up except that people seemed not to believe he did it.
I didn't make the thread, and the thread is not primarily about him sending nasty PMs.
I don't have much experience with nasty PMs but I don't think I would ever get one and report it that second. I'd try to figure out what it was all about, first.
But I shall take your method under advisement.
P.S. In Victor's case, it makes absolutely no difference what you do, because he's impervious to feedback, it doesn't matter who it comes from, even from a mod. A mod lets him know he was out of line, he backtalks the mod and announces they're bullying him or aiding and abetting bullying him. There has never once been even any gesture toward an apology or sense of humor about anything or consideration for the other side. So strategies for handling it are a waste of time. Report it, don't report it, it makes no difference as far as I can see.