It's a faint memory, even for Tidus, what he saw during their anchoring: nothing with definition, but colour and suggestion when he thinks about it now. But prompting Esteban, the mention of tethers; it seems Tidus is onto something, even if bringing up tethers does give him reason to pause. As briefly as he gets to question it internally.

Because, well- thinking about the bottle and the description he's given, that it ends with 'That's how I see you!' gives something new to think about. Like some kind of decorative piece you display in a house, but not exactly that - it's just the closest Tidus has in comparison to what Esteban's saying, which sure is giving him reason to put on a hard-thinking, puzzling face.

Which is his usual tight-brow look, where thinking seems like a tough job.

"So I'm a...bottle. In a bottle?" ...wait. "Is everyone a bottle?"

Does he sound like he wants everyone to be a bottle? Maaaaybe.