Another way to go about it is....
Click here to view the secret text
×Let him be trapped by roaches.
Need more? Complete spoiler:
Click here to view the secret text
×Kill the roach in the topmost passageway, but leave the other one alive. Go to the passageway on the left and hit the orb, so the door's protecting you. Stay at the top near the orb. Hold down the '5' key for a couple minutes. The snake should go to the top area above where the roaches are gathering. Wait long enough, and the roaches will trap him. Then you just need to smite roaches for another couple minutes.
____________________________
The greatness of a nation and its moral progress can be judged by the way it treats its animals.
--
Mahatma Gandhi