Without further context, yes and yes, I suppose. Normal criminals don't call each other 'my brother'.
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yizhivikaHi Madhulk,STOP THERE. that's what it means. it's a phra
It is quite possible that both "Hold nothing back" and "Leave it all on the floor" mean exactly the same thing here. They can evidently both mean "Give it everything you've got!", and perhaps the hoodlum/gangster is simply using the second of the two expressions for emphasis.