I don't disagree that it could be a communication issue. He has gotten angry in the past when he's been trying to say something and no one can understand him, however I'm not positive if that's the case this time because the first two incidents at school happened because he wanted to be the line leader and wasn't. That was pretty clear to his teacher so I don't think the students he pushed that day had trouble understanding.

As far as the room thing goes, I sent him there because he was screaming at my sister, wouldn't look me in the eye or even listen to me when I tried talking to him (at that time I was just asking him if she was yelling at him because he wasn't doing what she wanted him to - since that's what he was doing to her), so he got sent there to give him a few minutes to chill out before my FH went in there to talk to him. In our house we use sending him to his room as giving him a chance to reflect on his own and calm down before someone goes to talk with him more about the situation and get him to understand why he can't act the way he was acting. He knows he won't be in there for more than 5 minutes most of the time if he calms down and listens and responds as necessary.