It's mutual assured destruction. If he sues, they'll charge him. He will be convicted (although it is unlikely that he'll serve jail time or even pay a fine) and he'll have a criminal record.
If you want to talk about annoyed, I was annoyed by the fact that all of the critical information (his use of profanity, his "rolling of the shoulder", his "one or two beers") came at the end of the story.
He was held in jail. And beaten. On no charges. Without probable cause. You must be one of the police apologists that I keep reading about on FR. If that's the case, we're done.