It might be that at that school they really do tap out for higher ranks. A similar thing happens sometimes in TMA, and it leads to a false sense of ability. That sounds like what happened to him. If he'd had people make him actually get the lock (which should be clear well before there's a chance of damage on most folks), he'd know what it feels like when it's not yet locked.I was in no danger at all honestly I think it was a bad submission attempt more than my arm being bendy if I'm honest. Normally I'd feel something even if it's not tap worth but this one just felt like he was holding my arm so I think it was more poor technique