I always just think of it like a cycle (no pun intended). Maybe the reason he was so hostile in the first place was because of a previous bad incident with a cyclist. And now after another bad incident he'll be even more inclined to **** with a cyclist next time he sees one, each time getting more dangerous.
That's just the rational side of my brain, of course. In matters concerning *******s putting my life at risk I tend to anger quickly, and it takes a lot of restraint to keep from getting myself into a bad situation.