What the heck is she thanking him for? It doesn't seem like he's asking her to do anything she doesn't want, but isn't this just a kind of selfish request on his part? He doesn't have it in himself to really argue, however, only accept her company with as much grace as he can manage. She's being kind to him, and to Kai, so he just shakes his head very gently.

"Thank you, for staying." He needs this, he knows it. He'd never forgive himself if he succumbed to his own anxieties and just... left Kai like this. He didn't deserve that. And even knowing what he knows of Kai's feelings for her, there's no one that would have been more reassuring to have at his side under these circumstances.

"I'm glad you're here."