A successful Guard Impact is indicated by a sharp clashing metal sound as well as a dazzling flash of colored light. Both have the same general effect: the opponent's attack is deflected and he suffers a significant loss in Soul Gauge, while the defender sustains no damage. Pushing forward on the joystick will result in a 'counter', while pulling back will execute a 'parry'.
It is executed by quickly tapping the guard button and forward/backward on the joystick when an opponent's attack connects. A Guard Impact is a defensive move available to every character (custom included).