[So this is the former mogul of the wine industry in Mondstadt- Crepus Ragnvindr. He'd read about his death in the reports that the Fatui had on the events that occurred in Mondstadt before he'd even become a Harbinger, because the fallout was something that he was around for. How their man on the inside was thrown out by the Knights, discovered to be a mole.

And how his son went on to destroy Fatui troops, for a few years or so. So much that even they, the eleven, had to watch him. So much that one of the Harbingers themselves came for him, in the end. Anyone with half a brain could figure out why Diluc had done what he did.]

Hey, [he says softly to Diluc,] just remember, whatever he says to you is for the sole purpose of getting you to lose yourself. Don't let him get under your skin.

[He says that as his own self stares back at him, silent for the moment. The grown-ups are talking here and he knows better than to interrupt. But Tartaglia is bracing himself for when it's his turn, and he's got a good idea of what that'll be.]