re: Ex Machina is the best movie I’ve see in years SPOILERS

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And when the power fails and he flips out, I remembered that those don't last long.

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Ava did that at will. on subsequent viewings, I noticed that every time the power goes out/comes on, it is preceded by Ava touching an induction plate.

and in regards to all the doors opening, the door for Nathan's room was set to be the only one that locked