Not the right call in OT of a game at that level. Maybe a hold. But if you are an experienced fair minded ref- that hold is not flagrant enough to warrant a flat at that stage of the game. Let the teams win it themselves. Not given a guaranteed goal by a man up. No way.
Thank goodness your are not a ref. Just because OT doesn't mean you don't call a hold a hold. Cham won it fair and square.