TrackMonkey, FYI: the reason why it's sorta legal for that rider to do that move is because the
general rule is that a leading rider (the other guy) is not responsible for what is going on behind him. The trailing rider (you) is responsible for what happens in front of him.
That being said, the track director can tell if a rider is doing things on purpose and should have a talk with him/her accordingly.
But, further, in my opinion, TTown allows more "bumpin' and grindin'" than most tracks that I've seen. So, even if you guys bumped shoulders, I doubt that the race director would have said anything under the "If it ain't rubbin', it ain't racin'" rule