If Goolix is near the right of the tree-stump arena and the yellow, brain-like nucleus is hit by a Blue Pikmin, that Pikmin, or the other Blues that are attacking the smaller, blue nucleus may be knocked into the out-of-bounds, forest like terrain.Many things can happen when this occurs, either the pikmin will slide around(throwing Pikmin onto this ledge reveals that it's slippery,as the Pikmin will slide off)and then fall of the ledge and into the area with the Pearly Clamclamps or where the Main Engine was,or they slide too far for Olimar to call back(Some will even continue sliding until they are off-screen and then will die). These pikmin will be left behind unless you reset the day.