I'd venture to guess likely not at first glance - the guy was trespassing at that point and refused to move. The only alternative from that limited perspective

I'd venture to guess likely not at first glance - the guy was trespassing at that point and refused to move. The only alternative from that limited perspective is use of force. You can't just refuse to leave an aircraft when instructed to do so by the crew. The reason simply doesn't matter - the time to fight about that is off the aircraft. It may be considered excessive force however - which likely opens up avenues for assault and similar charges. Heck if I know though, IANAL and now I'm well off into the speculation weeds.