Cultivator. The word doesn't ring as familiar for Inigo. And usually thankfully Tidus's description would help, but in this case whether it's thankfully or otherwise is very much up in the air. Something about that very specific wording feels like it freezes Inigo's blood inside of his veins.

The people who fight the dead.

Inigo wills his mind to not travel back through memories, instead doing his best to force it to stay in the here and now. He's rather glad that Sizhui can't see him like this, but he can't quite hide the way his expression gets really awkward and uncomfortable for a moment from Tidus.

He tries to force it off his face though, instead working on the way his hands nimbly finish up Sizhui's hair - having finished putting it up. He gives Sizhui a small pat on the shoulder to indicate it's done before moving to instead sit down next to the other, though not quite joining the conversation just yet.