There was a separate attack yesterday when an old man was attacked, and another guy was attacked who tried to protect him.

It seems the attacker has been identified as a Josepf christian Evans. He was arrested last year (and many times before that). In 2018 he was arrested for public endagerment and unlawful use of a weapon.
https://pamplinmedia.com/pt/9-news/402604-299260-four-arrested-during-clash-between-patriot-prayer-antifa-

However, other than traffic citations, it appears that he can't be convicted. Even if he takes a plea deal, they dismiss the charge later anyways (not seen in image below).