Play on “bullet curtain”, I needed a way to refer to when enemies come in slow moving maze like patterns that simulate the ‘slowdown’ found in arcade style shmups when many bullets appear on screen. This used to be a hardware created feature (though intentionally utilized in game design) but modern hardware requires games to intentionally give players slow moving harmful mazes to navigate. Not every game has this feature – in many the enemies may be slow moving, but simply beeline straight for the player.