So let me get this right ...
A guy enters what is generally considered a gun-free zone (an airport) with an AR-15 and a handgun of some sort. He fires off 2 rounds from the AR, immediately drawing fire from an armed air marshal. Even though the air marshal misses, the attempt is apparently enough to cause the perp to pull his handgun and kill himself on the spot.
Tell me again why armed folks are bad and gun-free zones are good?
Also the air marshall missed his target.
Where did his bullet go?