Not necessarily, possibly arrested, but very unlikely to be prosecuted.
When I was a kid growing up there'd been a few rapes in the area. A guy in the neighborhood saw a guy by the side of someone else's house looking in the windows. He wound up confronting him and hit him and literally knocked an eyeball out. The victim was later convicted on several of the rapes and no charge was ever brought on the guy who basically sought the guy out and confronted him without being sure; charges weren't even filed on the vigilante.
Should the guy be arrested and prosecuted? I don't think so, but I don't blame anyone for arguing for that. Should the other guy be convicted for assault on the other guys and public intoxication, you bet. Should that first guy in any way be considered an innocent victim? No way. The second guy might be guilty too, but that doesn't exculpate the first for what we clearly see on video.