Easy Arena Win.

[Diesel]

Easy Arena Win

It is possible to fall through the wall in the arena, which prevents your opponent from being able to damage you, but still allows you to attack him. From the opening of the entry tunnel (e.g., where the gate drops at the beginning of a match), look back down the tunnel. On your left, between the rim of the tunnel and the wall, you should see a slight bank in the wall. First jump backwards into the wall so you are standing on the slant, facing the gate. Repeatedly jump forcing yourself back against the wall and as you do this turn to face the slant making sure you stay on top of it. You will now fall through the wall. As you fall through the wall you should notice a ledge that sticks out of the normal game boundaries right where the stairs up the tunnel start. Try to land on this ledge. Don’t worry if you miss the first couple of tries, you will simply spawn back in the arena with no damage.
Once you are on the ledge your opponent will walk down the tunnel and try to hit you but won't be able to through the wall and will repeatedly run into it. You on the other hand will be able to hit your opponent through the wall using either your sword, magic or arrows. Once you have disposed of the enemy simply drop off the edge and spawn back in the arena.
This appears to be the only wall in the arena where you can do this (the other three slanted walls by the tunnels don't work...)

Hope it helps (again lol)
~diesel