Already confirmed troll?? Newbies don't know who he is... They're not even aware of the meaning of the reputation and when they do become aware he can pretend it was all a misunderstanding and he was victimised. You can't expect everybody to go and confirm with the blockchain.
His tactics are to go from being your "friend" and making you care about what he thinks (as there are many users here I've come to care about) to doxxing and insinuating what he knows about you before he begins properly harassing, then back to hugs and friendship then back to punches in the gut.
To a passer by, it can look like some of his comments are sweet and innocent but when somebody goes from punching you to hugging you to punching you back to hugging you on repeat, it's not long before the hugs become less than comforting and part of the abuse!