There are too many "Kill _" threads popping out there. This one is different.
First of all, you are only limited to the technology that is available. You must not only kill the man, but you must also discover new technology before the guy gets too powerful.
Also, the guy gains powers and skills. One change is that the guy's HP grows to the quadratic formula based on the posts from his last death... (x squared [just multiply X by itself])
Just a few rules to start with...
No attacking yourself No discovering technology in an instant
I fire the cross bow from a tall tree at the guy's back, and try to hit his spine.
You manage to hit his spine.
-30 HP *-36 HP
[15/81]
I try to make a bigger crossbow (ballista).
After much work, you make a huge crossbow (ballista).
44/100
I stick some coal in another bowl-hat and put one, upside down, on top of it so it makes a hollow sphere. I meld them together and make a hole in the top and stick a vine in it. I give it to the guy, with some flint to make a fire and tell him that if you light the fine while sitting on the ball, something fun will happen.
It won't be a bomb, but the guy's bum lights up on fire, but runs to the water and hides there for a while.