Adam heard the sound of a bullet hitting the armor of the airplane. His response was to grab his shield and raise it up to protect himself (and the two people sitting next to him somewhat) in case a bullet got inside. Which eventually happened. It bounced off the ceiling, and then a wall, and then hit somebody else in the chest. Luckily, by that time it had lost its inertia. And while the lady clearly felt it, she was not injured any more than had someone tossed a tennis ball at her ballistic vest.
And then the aircraft began to fall out of the sky. It's a blur to him exactly what happened; he felt himself suddenly become weightless, and nearly blacked out. However, when the ship 'landed' (if you could call it a landing) he suddenly felt himself violently yanked back into reality. He went for his trench knife and cut his seatbelt loose. He stood up, somewhat dizzy. He had injured his leg just a little, but he hardly felt it thanks to adrenaline. It was however, a non-serious injury, the kind treated by sitting down for a little while.
When he heard gunshots, he hid behind the wall of the chopper. He heard Lily requesting an exit. He shouted "Agreed! Are any of the exits clear!?"