[ It seems both Rosaria and Kaeya are thinking along the same lines. One of the reasons why he hadn't bothered trying to plant Diluc's shard at the Tree is because he doesn't know if he wants to bring the man to a broken world either. Making him suffer through the same things that Kaeya is going through seems terribly selfish. He doesn't think he will be able to forgive himself if that causes Diluc any harm in any way.

So he'll have to content himself with the phantom manifestations of the past. ]

Keep our Grandmaster safe too.

[ Although he's sure he doesn't need to tell Rosaria that. ]

And no, I'll...

[ He was just about to say that he's coming with her. He shouldn't stay here for much longer or else he truly might lose himself in the past, but then Diluc looks at him with bright eyes. His resolve crumbles on the spot.

... ]

I suppose I'll stay here a while longer. I'll catch up to you soon enough, Rosaria.

[ Just for a little while longer, he thinks. Let him pretend that things are alright for just a little while longer. ]