Not the Smartest Cyberman

Spotted this evening in my spare room, a Cyberman was quietly plotting world domination, quite unaware that his mortal foe the Doctor had materialised right behind him.  

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I decided to leave them to it, closed the door, made a hot chocolate and when I returned, the room was again empty save for the smell of burnt metal and scorch marks on the floor. It's quite clear who won this battle.