question about behavior in child with SPD

I guess i Just need reassurance. Went to pick up my son at hte babysitter today after work, he had a great day there, but then at the end all the kids were running around (there were 7 other kids, they were watching some other people's kids) and my son was running around and then he started twisting people's arms. I took him home after that and he would not tell my why he did it.  HE fell asleep on the way home. Do you think he was just overwhelmed by it all and acted impulsively.  He did not seem mad or anything. I just feel bad about teh situation.  My son is in OT for SPD and doing better esp with the aggression, but I guess he will have slip ups now and then.

[mammo]

It sounds to me like he was overy excited by all the other kids being there and the chaos.  Boys tend to play a little rough and although he needs to know that we don't play that way, I wouldn't be concerned.