“Getting up costs more than staying down. That’s the problem.”
You’re on the ground. Moving is slow, standing takes an action, and anyone in arm’s reach has every advantage.
Effect: Your base movement speed becomes 10 ft. Melee attackers gain Edge on Attack Trials against you. Ranged attackers suffer Strain on Attack Trials against you. If knocked Prone while Climbing or Flying, you fall.
Removal: Ends when you Stand Up (1 AP) or are otherwise lifted.