They really took their time at the end getting on the helicopter didn't they?
After they think the pilot chick has left them she comes back, and the cities moments away from being nuked, and they got the king zombie hot on their trail, and they think its a good time to stand there and talk and the pilot takes the time to explain why she came back.
Literally they stand there talking as if they got all the time in the world. Then surprise surprise the king zombie gets to them before they can get away and it gets Batista's character killed and the pilot killed because they took the time to talk things out about why she left and why she came back for them.
It was just an unbelievably dumb moment in the movie.