What video did you watch? Surely the band member went to the venue planning to punch someone huh?
You understand talk is not equal to violence?
The guy was a harassing band member verbally but he didn’t touch him. Assault is illegal, verbally yelling at someone isn’t. The yelling jerk never got closer than a few feet, he never did anything that could reasonably be construed as a threat to the tuba players life. That’s the law.
Especially representing his school.