Why cut off her hands?


After the killer slashes the mother's throat in the bedroom, he then inexplicably takes the time to completely sever her hands. I figured there might some reason for this to be revealed later on, but it was never brought up again.

Was there any significance to the hand removal?

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She was trying to use the phone to call for help - he cut off the hand that was holding the phone.

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couldn't he have more easily cut the phone cord?

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