I talked to his teacher, who assured me that the two classes very rarely interact. I guess the kid has been there since December! I had no idea, which I guess is a good thing, because if he's been there since a month after DS, that means that he's at least not targeting DS at the moment. The teacher said that the kid's aggression is focused towards his own class right now. I guess that happens sometimes with new kids, they are trying to find their place and move up in the pecking order and so far, he's concentrating on making his place in his class, so his bad behavior is happening there, and is not involving kids from other classes. BUT, the teacher thanked me for letting them know, because once the kid has worked his way in and has settled in his new class, his attention could be diverted and then he might find DS a convenient target, so he said they will keep an eye out and he also made a deal with DS that if the kid says anything or does anything to him that isn't nice, he's to go to his teacher immediately so he can help and we'll keep each other informed if DS tells the teacher or us about an incident, we'll pass it to the other. So we will all be able to help him. It just makes me nervous having that kid anywhere in close proximity to my son. But, this school doesn't allow that behavior so I'm confident that IF anything happens, it will be handled.