Board Thread:General Discussion/@comment-50.129.241.31-20130407013257/@comment-206.132.109.83-20130720194657

"Perfect. Move up to the next cart. I'll set the charges." - Adam

Maybe she left because they were supposed to follow the plan? If you notice, he didn't set the charges, so he could have to set the charges to the unmoving carts and then escape, while Blake heads forward to stop the train or something.