A Force-out Foul occurs when a receiver is in the process of establishing possession of the disc, and is fouled by a defensive player before establishing possession, and the contact caused the receiver:
Force-out fouls do not only apply to an airborne player. If, for example, a receiver catches a pass in the end zone, but before they are able to establish possession they are fouled, and the foul means they lose control, but they are able to establish possession in the central zone, that is a force-out foul and would result in a goal.
Force-out Foul: If an airborne player catches the disc and is contacted by an opposing player before landing, and that contact causes the player to land out-of-bounds instead of in-bounds, or out of the end zone instead of in the end zone, it is a foul on the opposing player and the fouled player retains possession at the spot of the foul. If an uncontested force-out foul results in an in-bounds player landing outside the end zone being attacked when they would have landed in the end zone without the foul, a goal is awarded.