[ He steps further outside to keep an eye out for her. The air here isn't great, so he wasn't planning on staying long either way. The dragon that followed him is already eager to go back. ]

I do. I'm kind of afraid to take it out of my sight until we've got a plan. [ If it is leverage against the undead lords, he's afraid of what might happen if they find it. Or if their kid finds it. ] I don't know how Kaneki kept it hidden for so long. He could have been moving it when he disappeared.