Here's what the rear camera saw. You can tell he started to turn into my lane first then turn on his right turn signal on.
The rear camera could see his windshield perfectly so I'm not sure how he didn't see the rest of me. I have a feeling he was just looking at his mirrors on the side and didn't look ahead.
Good news is the guy behind me stopped to give me his contact info as a witness and my dashcam video saved so much headache.
If you don't have a dashcam, go get one! Insurance is going to cover everything but it looks like the other party is dragging it's feet.