I didn't really beat him per se, just damaged him enough so that he ran off.
When you start the level, if you run straight ahead past the center clearing and go under the bridge, there's an Attack Increase upgrade. I grabbed that, ran around in a circle until the worm charged straight at me, then double jumped into his oncoming path and hit him in the mouth with a heavy attack. After three successful hits (actually six with the twin scimitars), he said something about being able to see into my heart, then bailed.
My main problem with that level was I kept getting nailed by random bolts of lightning = instant death.
Ammadeau - yeah, level 11 is the forest with all those floating eyeball-fan things. I'm looking forward to retrying that level to see how high I can combo.
