My group aliens is moving around. At some point I remove a single alien and put it in a deadAlien group like this: deadAlien.add(alien);However, my deadAlien group does not have the same x, y as the 'alive' aliens group. they just move to the top of the canvas. Ok thats's easy to fix right? deadAlien.x = aliens.x; deadAlien.y = aliens.y;However, now my deadAliens constantly move around in sync with the alive aliens. Once an alien dies and is moved from the Aliens group into the deadAliens group, I need it to not change position (not to move to the top of the canvas), but also not have it's position dictated over time by the aliens group. How do I accomplish this?