I think Danito has something of a point. But what I find implausible is that the attack could have done that much damage so quickly. For one, what were they firing through - a glass dome? The weapon looked like an Uzi of some sort. It can fire 600 rounds per minute, but its clip would probably hold only 25 slugs. Even if piggybacked, they still fired alot more slugs than that. Also, keeping the copter in a restricted radius for so long a time is quite a challenge for any pilot especially if the shooter is firing from only one port.