Is it illegal to cut someone off and step on the brake? Is it even worse to cut someone off on a motorcycle!?

If I'm riding my motorcycle and maybe I got in front of someone while I was working my way through traffic (if I lane split or whatever is not relevant, lets just say I did; worse case scenario) and it pissed someone off. And that particular someone weaves in and out of traffic to catch me, and catches up to me a few minutes later. Goes around me while never fully leaving the lane I'm in, comes within inches of my bike, gets in front of me, s up to the car next to him by occupying two lanes with his car, effectively cutting off any route of escape for me and slams on his brakes causing me to lock up my rear tire. Had he kept his brake applied for a half a second longer I would have plowed into the back of him and maybe died. We were going about 50MPH. I think whether I broke the law initially or not, his crime seems to be way more severe. Even then when I made my way around him and through up my hand, basically implying "WTF" he started coming towards me with his jeep, trying to run me off the road. So I hit his mirror and sped away before he really did kill me. Then he starts tailgating me so I figure I'll pull over and we can have words if he wants to. He makes like he's calling the cops. And I took advantage of the moment and took off. So as to get away from him once and for all. How serious is his crime? Should I file a police report? I'm sure he got my license plate, and reported me, I think he really thought he was in the right. No matter what, though, he could have seriously killed me. Some poeple really need to learn to respect motorcycles!!