"...What?" Andrew's brow furrows as he looks at the two at the other end of the car -- and then turns to look at the one beside him. He doesn't let go of James's (the Master's?) hand, but that seed of doubt that was planted when he first saw the other two is starting to sprout.

He turns to his James -- that is, the one beside him -- and asks in a voice too low to carry, "What are they? Can you tell?"