Ejection

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Personally, as soon as the assistant coach starts arguing or really saying anything after leaving his box he and his head coach are benched.
I am not really a fan of benching normally but in this case this is explicatly supported by rule.
Plus the head coaches second discussion would have gone, "Can we talk about that play where you dumped my player?", "No" as I turn and find somewhere else to stand until he gets the hint that discussion during the game is not going to happen. Plus the rabbit ears comment gets him close to the boot all on its own, it is a dirrect comment on your judgement and integrity. Boot him and get a coach who wants to coach and not argue with you about a player who no longer is in the current game.

Jasper