"Whaaaaaat are you thinking of doing?" Grif sounds apprehensive. He's ducked down on the roof of the train, having found a handhold, and has to yell a bit because the wind makes it a little difficult up here. Mostly, though? Apprehensive.

Apparently, they're working together. There's something in the dream-logic of the scenario that makes this make sense, even though it doesn't.

He's hoping nobody inside the train has noticed them thumping around on the roof, but he also knows his luck is usually not that good.