How did Locke overcome his inability to kill before he attacked Naomi?!

Question: Walt/Jacob/the Island told him to kill her. and Locke listens to the Island/Jacob/Walt.

Answers: Walt/Jacob/the Island told him to kill her. and Locke listens to the Island/Jacob/Walt.

Locke knew he had to do it. If he had any other choice I think he would've took it...

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