Here's one from last year. We were coming around to lap him.
http://www.youtube.com/watch?v=lyUIiwg1rMU&feature=channel
what kind of dick move is that on the straight? He's a backmarker in a Sm blocking an ITC car? Ass.....
he needed to be turned.
Assuming he's been talked to in the past, I wouldn't talk or warn him at all at this point. I'd talk to all drivers involved, tell them the next incident is getting paper written. Team up if the $ is an issue, but a protest of on track actions will be cheap. I'd gather my videos like that one, and wait. I would race him clean and hard. I certainly wouldn't get out of the way if I was in the right. Then when he did something similar, to anyone, he gets written.
Flagger reports, video of that incident, and past incidents will be submitted. The Stewards will reject the past videos, of course, but, it won't hurt for them to see one ....
Once you decide (you've decided) to do it, do it all the way.
At this point, I'd say paper is overdue, so, in my eye, the last thing you want is him trying to clean up his act just a little, around just a few guys, as he would if you had a chat with him. You want the maximum attention and penalties that you can bring down, and the Stewards are the ones to hand that out.
Don't worry about being mean, the system will protect him, and will treat him fairly. But it can't if you don't start the ball rolling.