He wants to beat me up now, haha!

I refer to this thread I posted about 2 weeks ago: https://www.reddit.com/r/asktrp/comments/46ks3s/annoying_weirdo/

He was sacked with about a month's notice about a week ago. His last day is the 14th of March.

Today he was at his usual antics, throwing things into peoples' crotches and flipping the pause button on my computer to annoy me. I basically attempted a bully back mentioned in the other thread:

Laugh along with him and learn to bully him back. Put your finger in his ear when he's not looking. Call him by a retarded nick name "Hey One Nut, what's up?"

He got angry, leapt off of his chair, went off on a tirade about being suuuuper mad, and stormed out of the room. I later found out from a coworker from his wing that he is furious at me and wants to beat me up after work, and I should 'apologize to him'.

There is no fucking way I am apologizing to him.

How do I train to fight off the fucker when he attacks me? He's fat and has big biceps and about 9 days left of stalking to use on me. I've already reported him to the manager (who admitted he was looking for trouble with a lot of people because of his sacking).

He will definitely hit consequences if he tries but by then the damage will be done. How do I control the physical damage he will inevitably attempt to deal to me?