you can prove your Z was perfect on wednesday so your word is backed up pretty well. "i didnt do it". Not to mention the wording of his ticket does carry some weight. (hell, his ticket has the word accident in it)
Go for the throat. what a dirtbag. No way in hell was he personally going to get in trouble for that so i dont see why he had to be a prick and try to leave you screwed when he carries insurance.