I'm with Chimpo on this. The game will have to have some kind of barrier at certain bosses, right? Why not just make the barrier part of the scenery, it will look more natural and better than any border. Don't start arguing about not making any sense, it's a game. You have to make choices, right? Choice is to make hidden borders (IE the totems) or obvious borders (IE shrinking to 4:3 with artwork or w/e) This isn't an issue now anyway, we're still on EHZ and that boss is no problem.