Don't Blink! - Blink - Doctor Who - BBC

The Doctor explains to Sally and Larry that he and Martha were transported to the past by the Weeping Angels. The Angels are "quantum locked", allowing them to move incredibly fast when unobserved but when they are seen they literally turn to stone. They cover their eyes to avoid looking at each other, giving them their weeping appearance. He warns Sally not to look away or even blink when they are around.

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