When the troll comes back, unless you've agreed to help reporting things and stuff and aren't triggered by g*re, please don't check your message wall, at all. don't check notifs, just log off.
If there are already a few posts announcing that the troll is back, then people already know, and there's no need for any more posts, so if everyone already knows the troll is back, that's enough. They know they're back, and they can make the decision they want to make from that info, so all posts negatively related to the drama become excessive and won't just be locked, they'll be deleted so he doesn't see them, because they're exactly what he wants.
Stay safe and take care of yourself because you matter.
Edit: if you have questions about what's going on, check posts, or message a mod ( @Stitchy0 , @KadeButton22 , @Dreaming-apples , @MintyLife88 , @Double-bi , and @Cryptocrew , and of course me)