(Then I shall take it, hmm?)
With your force-field around the hill, nothing can get in or out. Oxygen slowly starts to deplete from the hill, causing Gandalf to pass out and the force-field to waver. I then walk up the hill, and smack you across the head with Gecko's shovel. The hill is now mine.
The grizzly bear then eats you because it thinks you are a fish, it then walks away to find more fish to eat. I take the opportunity to climb the hill and make an indestructible bedrock fortress covered in 16 blocks thick of lava and surrounded by 1000 loyal dovahkiin who will Fus Ro Dah anything in sight.
I move to Arlen, Texas, and become a propane salesman. I then become the King of the Hill, with a life so uptight and boring that no one would dare follow in my footsteps.
I determined that devil is now not a threat to capturing the hill, and that there is not much of a hill left thanks to leech. So I decide to build the hill up before conquering it by sending an asteroid down from space onto leech's 1x1 tower, crushing leech and his tower. However, I made sure to slow down the asteroid just before impact so that it only crushed leech and his tower and left a nice new hill of space rock for me to be the king of. Also, I become a god to all humans who watched this and am feared and worshiped all around the earth.
Good thing that my mind's controlled by a blind squirrel. Using your newfound fame against you, I build a temple for you away from the hill. You come down to live in luxury while I clamber up the hill and dig a hole to live in.