Thats no different than me having my video camera in my car, recording my driving… then accidently capturing me getting pulled over and what ever happens from there. I was intending on capturing my driving, so so happens I got pulled over and clubed for no reason too.
In both cases one side has to prove they video guy wasnt really trying to capture the cop doing shit, the other side trys to realllllly make it look like the guy with the video tape at the parade was intentionally video taping the arrest.