Casey buries himself in the purpose of it. He pulls Kira gently until his shaky knees are upright enough that Casey doesn't have to worry about him immediately collapsing. He could leave. He could bolt. But right now he has work to do, and that work is making sure Kira doesn't work himself sick or dead. It's hypocrisy at its finest considering his daily routine of working himself to the bone, but he'd never learned that word or the meaning behind it.

He slips an arm around Kira without asking. He tugs Kira's by the wrist around his shoulder and takes some of Kira's weight for himself. If he thought Kira would let him, Casey would force the other man onto his back and just carry Kira back to the inn. He wouldn't be the first Casey had done so with in his life and he knew he could manage it fine.

Instead he takes a step to test, to make sure Kira's going to move his feet when Casey does. If he refused, then he would have to deal with being carried like a backpack back to the inn.