This is definitely a weird otherworld tradition. Roland is totally invested, no matter how bizarre the entire thing is to Tidus. Meeting Inigo's look, eyebrows raising and a small tip of his head given in turn like a shrug. Well, this is Roland for you. Apparently.

Admittedly, this small exchange does make Tidus miss half of what Roland is talking about. Something about- trading and candy? And now Roland's waving around a candy bar...

"Hm, yeah. Can I have a look at that and see what it is?" Tidus follows Inigo's confusion, holding out a hand in interest. There's nothing that can go wrong in complying, with Tidus taking it and reading off the branding and what it's supposed to contain inside. Ah- A peanut nutty bar?

"--I'll keep this," he declares without pomp, slipping it into his white overcoat. "He already ate something from the pile! So I don't have to trade!"

You know, because that makes absolute sense here.