How can he move when Alucard is doing that? He wasn't going to leave anyway, though eventually he'll need to get up - to retrieve water, or juice, or something else that might help Alucard. But for now Rhy can't find it in himself to move.

He's worried, he doesn't know how long this will last or what will happen, but he thinks that Alucard is undoubtedly even more distressed than himself. The least he can do, all he can really promise, is that he'll stay.

"I'll be here when you wake."

It's a quiet promise, one he isn't sure Alucard hears, but he gives it anyway. More for himself than anything.