Long story short, he's trying to screw me out of a promotion that I am the best candidate for. Several months ago, he threatened to strangle me over re-work that wasn't even mine in any way. Recently, I've come to find out the conference room is bugged with a mic, the conference room door was open when he said it, and there's a chance it could have picked up his comments. There was one witness, although I'm not sure he was paying attention, and one person who saw that I was visibly distraught, whom I told what happened. I drafted an email to HR the same day it happened, but never sent it. I remember the day it happened and the approximate time. There is a zero tolerance policy for this kinda stuff and he'd likely be fired.
Should I?
Also besides that, anything else I should know?