I want to play devils advocate for a moment.
Let's say that if these two blokes instead of being a cyclist and motorist were just two blokes walking down the pavement. The first bloke (the one that was the cyclist) is in front and the second bloke (the motorist) is behind. He can't get around the first bloke, and when he finally does he stops and punches the first out.
What would be the punishment? Depending on if it's their first offense or not, a month or two in jail and/or a fine, right? So just because they were a cyclist and motorist why should the motorist have to face a harsher punishment? I mean it's not like he used his car to assault the cyclist, right? He just got of his car and punched the other bloke out.
Yes, it was wrong, and he should be punished. But the question is what should the punishment be?