Tidus feels Inigo's worry, reassurance returned in response, like it might be his own worry to dispel. We won't know unless we try. There's the worry already that it won't work, but trying, doing what they can - that's how Tidus is, has to be. Hope, and if it doesn't work, try again, try anything.

But he's following Senku too, at least having enough presence in this place to be able to walk. Really, there's nothing different from when he usually travels to places on missions, but there's that nagging, that something might happen; a worry about this whole anchoring thing, that he'll lose himself if he loses focus. Tidus keeps his eyes on Senku; and when he pauses at the bridge, Tidus pauses too, before he even realises the nothing he sees - hears the voice.

"Se...ku...?" It's strange, odd. "What is that?"