I'm just saying I didn't even see it was a choice, I saw the first person run up to the train, and thought it was a "hurry help both of them!" deal, so I grabbed the first person I had my mouse over.
Here, I just randomly searched youtube for someone playing the part, and look what this guy does. http://www.youtube.com/watch?v=edNP5HjOSMc#t=10m10s
He didn't really see the choice either, it's just a reactionary click.