Hello, I'm making a basic /togglepvp plugin, but I'm not sure how to cancel the warmup if the player moves. When the player does the /togglepvp command, he gets put into an arraylist. Then I have a PlayerMoveEvent checking for a player in that arraylist. If the player moves, he gets kicked out of the list. I'm just not sure how to check if the player is no longer in that arraylist while the scheduler is running so I can cancel it.