Would you have done the same

[Forksref]

If I had heard the coach say " hit someone and knock them down" I would have talked with the defense about not making unnecessary hits or cheap shots, keep it clean, play with class, etc. (Preventive officiating)

"Bulling over" doesn't sound like a foul unless a forearm was thrown or something like that. Just because a knee is being taken, all players must be ready to defend themselves. "Bulling over" the QB would be a foul if he is taking a knee.

Preventive officiating works.