The boy was scared. And confused. And as Raz0r delved she saw what had happened to this one. Yes, he was mentally behind his compatriots -- but he was smart. So smart. Emotionally, he was a child. And his friends, all of them, had assured him that going after Rachel wasn't wrong and that he wouldn't get into trouble. They had assured him that it was perfectly normal and that she would have fun.
It wasn't until after the deed was done that he realized that the girl's struggles had been in fear and pain.