It's actually the top right part of the bottom area. The game does indicate to you where it is at the beginning of the stage, although I too missed it the first time I fought in that stage. --- (Rogue Galaxy Board) shiva: Oh lol. Then you're the most dedicated troll ever on a board xD
Yeah the game shows you the escape area. That's why I went there when I first tried it. But it just didn't trigger the end of the battle. I guess the problem arises when your character is too close to the respawning enemies thus attacking them and not being able to trigger the end of the battle.
But this really could have been implemented a little less glitchy.