Leela's psychological struggle with confinement and her growing awareness of the Doctor's manipulative methods

The Doctor places a volatile helium gas canister beside Leela inside a cramped cubby hole. He outlines a precise but dangerous plan: when Dask arrives, she must open the valve, …

In the cramped hidden space, Leela’s helium-altered voice pierces the silence as she panics while still bound. Her desperate cries snap the Doctor from his tactical focus, revealing the flaw …