Well if youve beaten the champion you can still compete but against normal environment enemies (Goblins etc). The tactic works for them too, just jump up high and pepper em. Means you can take on three at a time and beat em without any problems.
I discovered the bug when i was due to fight for the championship, but ended up reloading so that i could go complete his quest first, and then obviously i didnt need to worry too much about using the bug...
$1 tax for the national debt?
Diablo & Diablo 2 for the DS, it makes sense Blizzard!