The other morning i was beating up on Cyrax with Blaze in the Tomb in practice mode. I was hitting him with a branch combo in the south east corner; one of the hits pushed him through the invisible wall. I could still whip the fireballs at him and everything; after mashing a few buttons i was able to get Blaze to step through the wall too. We then could walk around the outside environment: through two-dimensional skeleton soldiers, inside the pillars, etc. I decided to hop back into the arena to see if i could get out again; but i couldn't.
Has anybody else done that in any other arenas or with any other characters?