[ Istredd makes notes of the places he's been so the next time Cassian disappears, he might be able to go looking for him there. He's following River, perhaps, but Istredd is also a god, he may be able to follow the trail. He doesn't want Cassian to become stardust forever. His memories of Cassian are never about who deserved what. They were family. Deserve doesn't come into it. He's just glad to be remembered. ]

Recently. That may be why you found your way back here.

[ He doesn't know what it is exactly that connects the two so they can always track each other, but it isn't a full surprise that Cassian is here shortly after River returned home to see him. They even talked about Cassian. Istredd doesn't know where his errant child is now, where she went after they parted, because he's always been an unmoving waystone to her. There when she needs him, but never clinging or trying to hold her back from her path. ]

I don't know exactly where she is right now, I'm sorry.

[ They talked of having a family outing, but they didn't know where he was. He reaches out to grip Cassian's arm like he's unsure if he will disappear at any moment. Sometimes that happens. These are fewer and fewer good moments to pick from. ]

If you stay, she might come back, and we can go somewhere together. The three of us.