Any foul deemed 'flagrant' by the official.
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Yes, he can as long as his team isn't also in the playoffs. High school football is pretty open anyways almost anyone can be on the sidelines helping out.
By unnecessary roughness on a high level or unsportsman like conduct also on a high level or beating up someone or fighting.
No, Because the coach was never in the the game he/she just monitors the game to make sure everybody plays by the rules and to keep up with the scores