Mister Sin's operatic function as obedient weapon while embodying the Doctor's moral universe

Leela turns the tables on Mister Sin by seizing a knife and hurling it into his throat, paralyzing the automaton’s advance. As Sin lurches into the hall Chang readies Litefoot’s …

Leela exploits a moment of chaos to escape indoors, only to stumble upon Chang and Mister Sin’s hasty retreat via hansom cab outside Litefoot’s home. Ignoring the Doctor’s shouted command …