I wouldn't call it a threat. But-- like I said, she's missing part of her memory. The last thing she remembers is... what happened after that.

When we tried to leave, but were stopped by a god who called herself the "sustainer of heavenly principles".

[The powerful being who appeared for only an instant at the end of his dive into Aether's soul. With a title like that, just who could it be?]

I was captured and sealed away. I lost all of my original powers, and... spent the next 500 years trapped in a nightmare. But Lumine... I don't know what happened to her. But whatever happened changed her enough to where... when we finally did meet again on Teyvat, she didn't even look happy to see me.

[The way he so quickly glosses over what he was subjected to in that time isn't unintentional. Because for him, none of it compares to how much it hurt to finally find Lumine, only to be brushed off.]

[He's been holding himself together so far, but this-- this causes a tremble to his voice, as his hands tighten into fists.]

I don't want her to remember any of it. Maybe it's not the right thing to do, to keep it from her, but I... I can't lose her again.