I need help.

I was playing this last night and I got to the top of the trees (just under the leaves that is) and there's that other night flailing around trying to kick my ass. I can't seem to kill him. What am I missing? I tried stabbing him with the sword. I tried hitting him with that throwing knife. Nothing worked, and it's been so long since I played this that I drew a blank.

And how the hell am I supposed to get that chest sitting on top of the foliage?

I don't know why I like this game I just do. I think it's a Rare thing (I started playing this right after playing a little RC Pro Am).