Shine spike
The Shine spike is one of Fox's edge-guarding techniques. It consists of using Fox's down B to spike an opponent who is already off of the stage, down and away, to prevent their recovery. The Shine spike is especially effective, because the Shine has set knockback and stun, making it as capable at zero percent as it is at three hundred percent. Also, since the move slows Fox's vertical movement, it allows him to easily recover after spiking.
In Brawl, the technique loses some of its effectiveness, due to its variable knockback, but it still highly effective at stopping opponents with less than average recovery. Floaters, characters with two recovery techniques (such as Wario} and characters with a Tether Recovery are generally able to survive it at low damage percentages.