[ Kurapika watches with careful eyes, trying desperately to discern whether or not he can even trust that the man is actually seeing anything. For the time being, he has no choice but to hope what he says is true— that the baby isn't on board at all. His expression hardens, considering carefully whether or not to show anyone on the train a peek of his ability. ]

Very well.

[ With a short sigh, something in the air around him shifts, as if a very dense shroud of pressure were enveloping him - something that wasn't there before. It's pure energy, what they call nen in his world - something he'd sealed away the majority of to conceal his presence as soon as he realized he was on the train. He's certain the man before him can sense it, and must be well versed in something that's the cousin (maybe twice removed) of nen.

Only after making sure no one is looking in their direction, Kurapika holds his right hand up, and the energy condenses around it, materializing into five metal rings, connected to chains that wrap around his wrists several times underneath his sleeve. ]

Typically, this is a tool for locating people. [ Between his index finger and thumb, he tugs out one of the five links of chain - there's a small weighted ball at the end of it. ] But the car is interfering with it. Or, as you've asserted, she really isn't on the car.

[ A pause. ]

You can sense it, can't you? This kind of energy. You have something similar around your body.