What I have thought all along. If someone if holding a gun and says be quiet or else, what are you likely to do? It could have been out of the attendant's view, also it was stated the guy acted nervous and just bought a few gallons and then left. He was probably afraid she was going to try to alert someone or jump out of the car. Gosh I wish she would have. We don't all react the same way, I've often thought about what I would do in a situation like that.
A long time ago, I read that if you are grabbed and leave the scene of the abduction, odds are not going to be in your favor. Do whatever you can to get away at that moment, regardless of what type of weapon the perp has, cause what is going to happen to you later will be worse. It's a horrible, ugly thing to think of, but we see this more and more frequently : ((((