Coach physically intimidating an opposing player

[CoachJW]

I'm a high school varsity boys coach and had a first today. The opposing coach called timeout with the ball right in front of his bench. His player picked up his dribble and my player that was guarding him put his hands up as if to deny a pass. The solo official was all the way across the floor and blew the whistle, but my player couldn't hear it because it was a loud gym. The opposing coach yelled again, "I called TIMEOUT!" and this time walked out on the floor and got right in the face of MY player--literally nose-to-nose and yelling again, "I SAID TIMEOUT!"

It was a bizarre scene and there was no justification for the behavior on any level, it was completely unprovoked. Is this a T, an automatic ejection, or something else in the rulebook? What would you do? Also, what would you recommend that I should have done? Obviously I want to protect my own player from this crazy lunatic, but depending on the officiating crew, I might find myself with a T or be ejected right with him if he became confrontational with me. I know fights are a pretty big gray area for rules interpretation, but generally speaking, if an adult is physically intimidating a kid that's not even on his team, how would you handle it? Thanks.