If you can't tell the difference between an illegal assault on an unsuspecting innocent, and somebody stopping a bully's assault, then maybe you don't belong on FR.
If I was intervening against a bullying thug, I would have no interest in trying to be "fair" under your rules. My objective would be to stop the assault with as little risk to me as possible.
LOL! The thug was just a loudmouth kid. If he was pulverizing the little guy it would have been different
You and I see it quite the same way.
The kid who threw the punch was at an apparent physical disadvantage (from my perspective) to the bully, and the kid who got spat on (spat on) and assaulted was clearly physically inferior.
Some people have their own agendas and opinions on something unprovable, and you can’t argue with someone’s opinion if they are determined to stick to it.