It's far enough up your arm that if he hits the nerve hard enough, it will paralyze everything from there on down. I know you work out, and so you'll have a fucked up arm that atrophies over time due to paralysis and one that's normal because it gets used. Palpate it often to make sure it's healing right,
otherwise if it heals crooked, they'll go in, break your bone again and hope it heals straight the next time around.
Sorry, I'm in pretend-doctor mode after seeing patients here. Got enough money coming in, I got another Bimmer on lease. I knew you'd like to hear that.