The Master's dutifully trotted behind Kaylee into the hallway leading to the engine room, his head turned toward that distinctive sound. Someone running. It's something of a surprise when it turns out to be a small, barefoot girl, but he's more irritated by the interruption than anything else.

He stares back at her like an animal in a territorial standoff, but he keeps his tone pleasant if pointed. "I was under the impression none of us belonged here. Have we met?"