Reply to Re: To kill Jack
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You *can* kill him, but you don't *have to* kill him. It's not essential to the story or anything. But personally, when I do it, I buy a bomb from the weapons shop and try to time it so that Jack walks into it just when it goes off. That'll either kill him instantly or leave him so weak that you can kill him with one or two punches or slashes from your sword. 
