Pushing the heavily damaged door aside with a screech, Beatrice provided her name and urged the agents forward. She guessed they had 10-12 minutes left before the auction was concluded and to her point they didn't know if there would be any more endangered passengers or how many more gunmen there would be. Following her own advice, she raced up the aisle to quickly duck in one of the rows of seats about a third of the way down.
Picking his self up off the floor, Sebastian shrugged and followed the strange passenger who seemed to have taken charge, moving into the car and following Beatrice's example -- ducking into a row of seats opposite her.
Whitmore - Beatrice would be able to hear the gunman enter though wouldn't necessary know how many, but it would be your next turn to act. Depending on what she does, she would then see (or hear) more gunmen enter. Also you are correct, you have 0 AD