Means sweet fa when he spits 3 discs out of his spine
Good luck I hope he never goes thru that as I've seen quite a few who never lifted again after doing stupid shit like 500lbs shrugs with bad ass form
Keep it safe, hard to tell a young ego filled and god knows what else junior (been there done that)
But your back..,, you only get one,
I trained with good form (most times) and still have life long nagging injuries now