Exploration and information-gathering is going... Well. It's going, and that's something. From the back of the train to the front, and now Ghost is starting to work his way backwards again, this time with more attention to detail now that he knows the layout.

The sight of a person in a white coat is enough to slow him down, at least. (That, or the feeling of ice, hard and sharp and not familiar but something close.) As a result, he pauses at the end of the row of seats Vexen has occupied. The fact that the guy isn't in the generic matching outfits of the new arrivals is probably a good indication that he's been here for at least a little while.

"So, if I was going to ask your scientific opinion on the whole train thing, would you give it to me?" The voice comes from the phone clipped at his waist, but other than that, there's not anything overtly strange about this particular new arrival.