[Hangar]
The hangar's ground crew are pretty on top of their game. But they're not going to walk into a shootout. The hangar's sprinkler system activates immediately, dousing the area over and around the exploded helicopter, but any nearby ground crew immediately duck for cover.
The hangar doors begin to close as well, as the people in the flight control tower order a lockdown, which likely adds to the confusion. The hangar doors aren't terribly sturdy or armored, being essentially glorified, giant-sized horizontal garage doors. But it's quite a long drop down out of the hangar anyway.