"Brace yourself." That's it. That's the advice. He can elaborate, sure, and he - fuck it. If there's one thing he can do for someone else, it's give them the full scoop on how bad things can get here.

"If you have any worst fears or bad memories or things anyone can exploit - it'll find a way to make them real. Or real enough to you for it to matter."

It's not great advice, especially since there's nothing that can really be done in the face of that besides just grit your teeth and hope it doesn't go too badly. But a warning's better than nothing.