Yes. He was no innocent bystander just videoing the event. He assisted the McMichaels by chasing Mr. Arbuery with his truck, nearly running him over and corralled him into the McMichaels pathway where he was subsequently shot by Travis McMichael. Mr. Bryan was an active participant who assaulted Mr. Arbuery with a deadly weapon (his pick up truck) as he intentionally assisted the McMichaels. Thus Mr. Bryan committed felony assault and was an accomplice to murder. In legal practice an accomplice to a felony is as guilty as the individual committing a felony.
It seems a little extreme.