Koschei frowned slightly, unsure just what Theta's problem was because hell, it definitely seemed to him that there was something wrong. But then he had said that Koschei was getting worse so maybe he did something that upset the Doctor? Something that made him want to fiddle in his mind. Though he couldn't imagine ever consenting to letting the Doctor in his head after that whole times table thing. Grabbing the notepad, Koschei sat upright and started to scribble down his list. In Gallifreyan. Well, he didn't think the Doctor would want English. He barely even realised the TARDIS was translating him into English in the first place.

"Okay, there you go," Koschei said as he hopped to his feet, holding out the list before moving to the door. "Let's go then! Get the stuff we need and start working on it."