Legendary Dudes of Awesome
A weapon or power not only knocks the target off his feet, it sends him flying. When a character is hit by an attack with the Knockback property, roll Stamina + Athletics as a reflexive action and compare the successes to the successes on the attack roll. For every additional success earned on the attack roll, the target is thrown backwards one yard and knocked prone. If the Stamina + Athletics roll earns more successes, the target is not thrown backwards and does not fall prone.