Ok so there are classmates who are indifferent, but scared to say anything because the ones leading the group. That does open up directions for this to go.
Not really, he is more callously indifferent. Which is completely different then level headed. A level headed person would see a child drowning would call 911 for an ambulance, then look for a safe way to save the kid without putting himself in danger. A callously indifferent person would just keep walking, maybe call 911 if he wasn't busy.