you know how sometimes when you're playing a video game and you save...only to be killed five seconds later? and there's no way to get out of the kill loop? that's how i imagined this film ending. i'm glad it didn't end that way though.
Something like that happened to me in an old computer game back in the old 8086 computer days. It was a Sierra adventure game called "Police Quest." At one point you arrest a car-thief and take him to the local jail to incarcerate him. Before entering the jail you're supposed to lock your service gun in a locker outside the front door, which I did.
Unfortuantely, I had forgotten to frisk the suspect when arresting him in order to recover his weapon. So when I took off the cuffs he immediately drew on me.
I tried to restore an earlier save point but hit the wrong button and accidentally saved this situation. The suspect didn't fire or move just stayed there with his gun drawn. The game wasn't officially "ended" because you could still type commands into it although nothing you typed worked and you couldn't move. I suspect a "game over" situation had been reached but there was some error in the game's code preventing an actual "end condition" from being achieved.
It was then I learned to not only be sure to keep the save and restore buttons straight but to always save often and have multiple save files rather than one.