[Kitchen! Right! Good! We're going to the kitchen! He realizes, once he's out the door, that perhaps this place is more familiar than he first assumed, and before he knows it, he's able to fish a first aid kit out of the kitchen and come back without any trouble.]

Dad, I found it, so where are you--

[He pauses, looking from Kiritsugu, down to the first aid kit, then back to the first aid kit in his hands. He realizes, suddenly, that he's not sure why he's calling Kiritsugu dad, or why he wants to help so badly, but it's a reaction he can't suppress - he wants to help the man who, as far as he knows, was nearly responsible for the death of both him and his father.

The first aid kit hits the floor, because suddenly his hands are trembling more than he realizes]

...what am I doing?