In order to acquire the hand bomb, you'll need to backtrack and go to...
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1S4E in Rule 5 and kill the blue rattlesnake. The bomb is located (directly below) in the secret room 2S4E.
I'm afraid, however, that I'm totally clueless as to how to kill the captain without using either the invisibility potion or the bomb, so someone else will have to help you out with that.
On a side note, I'd actually switched to using my current avatar
before seeing yours, so I hadn't meant to simply copy your idea. (And here I was thinking I'd been original and clever.)
[Last edited by Lamkin at 11-01-2008 10:22 AM]