When a player rolls doubles on a successful attack roll, the target is knocked back after any damage taken from the attack is applied. Knock back represents a character being thrown backward by the force of an attack. Certain game effects might knock back a character or allow a character to ignore knock back (Examples: Powers: Charge; Abilities: Great Size; Other effects: Multi-base characters). Game effects that allow a character to be knocked back or prevent knock back are checked before damage is dealt.A knocked back character is moved back one square for each 1 damage taken. Move the character in a straight line away from the attacking character—called the knock back path—even if that path is on a diagonal. If multiple characters take damage from a game effect that causes knock back, resolve the knock back starting with the character farthest from the attacker.If the knock back path is not along a straight horizontal or vertical line, then the knock back path follows the diagonal line starting with the square that is on the opposite side of the target from the attacker, in both the vertical as well as horizontal direction.Movement along a knock back path ignores the effects of hindering terrain and objects on movement. Game effects that activate as a result of a character moving are not activated by a character moving due to knock back.
•(10-04-2012) (Example) Black Adam wants to attack Morgan Le Fay, so he declares a close combat action and prepares to do a close combat attack. Since Black Adam rolled a critical hit, Morgan Le Fay will be knocked back from him equal to the damage taken – she is tossed 7 squares away by the sheer force of Black Adam‘s attack!Keep in mind that if the attack roll had not been doubles, Morgan Le Fay could still choose to be knocked back thanks to her Combat Reflexes – however, she does not have the option to not be knocked back. Combat Reflexes lets you get knocked back more, not less. Being knocked back is a little tricky timing wise: