"Attack a train. It's just a train." The look of confusion on his face indicated that more explanation may be needed.

"It is a device that conveys people from one location to the next. It is not a threat to you directly." Well, of course, there was that whole 'tethering' thing and the fact that so long as they were on the train they could never die or return to their place of origin.

...but now wasn't the time to be that factually accurate...