Regarding sharpening the branch, I've added a response for cut, chop and sharpen to indicate that "You take a nick out of the branch, then have second thoughts. The branch may come in handy later."
Regarding TALK TO TROLL, the first response is correct, the second response is a bug, the third response is background processing. If you hang around the troll for a while, you'll see that he does things randomly from time to time. In case you're really interested, there's currently a 30% chance that he'll do something and there's 10 random things that he'll do. Some are quite funny. (At least I think they are.) If you try enough different things with the troll, you'll see that he's got quite a strong personality.
Regarding the bug, I added a generic response for TALK, but forgot to go back and add a :done; after the existing responses, so it was giving the first response, then falling through to the general response. Fixed now. There might be more of these. I'll check them now.
Thanks for the comments.