Corrected entry: Cochrane's chopper has a 12.7mm or 20mm cannon on the side (it can't be a 7.62mm as it has already been shown that Blue Thunder is armoured against small arms rounds), The round that punched through the glass should have torn Murphy's arm off.
Grumpy Scot
20th Nov 2004
Correction: It's entirely possible the round was deflected when it came through the window, and Murphy was struck by a shard of the window material instead.
johnrosa