Do you really think that Jack would stop for Locke? Jack has had it up to here with Locke, that monger would go in there and take what he wanted without a care in the world about what Locke thinks.
Jack wants to kill the others, but the others will kill them! Stay on one side on the Island, lay low, that is what they asked of him, it is not that hard(unless you are thirsty for blood).
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