Area, Side
While riding your scooter, you take your sword and cut out an area on the ground. You carefully cut all the sides as you go. This area's all yours now!
Imagine riding your scooter around in a really large area, pressing your sword into the ground as you do. Once you've finished carving out the sides of the entire area, you claim to everyone around that this is YOUR area, and they aren't allowed in.
へん
あた, べ
None
As you look down at your area with its sword-carved sides, you suddenly realize there is a hen (へん) pecking at the ground in there. "Um, excuse me, hen, I believe I said this is MY area?!" You try to kick it out, but it hops over your leg.
Imagine doing everything you can to get this hen out of your area, but it manages to dodge and outwit you at every turn. You even slash at it with your sword and try to run it over with your scooter, but the hen can't be stopped. This is the hen's area now. You have been defeated.