Tobirama tailed in with one of the groups but remained silent for the majority of it. He took this time to observe not just this representative but the others of his group. Mannerisms, body language, the way information was delivered. Perhaps its because he is new to this train but he does not share this trust in the train that some he's noticed do. That said, he's not exactly eager to trust this person either. He wasn't around for it but he had heard of their less than exciting intervention. The false mission and all that.

"What about this case are you investigating, explicitly?" Is what he finally chooses to say after a long period of watching and listening. He's not one to bark out thoughts or demands without further details.