After a knock-down:
A: whiffed Short Cannon Strike-> crouching Short-> crouching Jab-> Roundhouse Cannon Spike
B: whiffed Short Cannon Strike-> kick throw
Option A is used against an opponent expecting to block a regular jumping attack as they wake up. In this case, you mix up by switching to a combo which must be blocked low, and is hit-confirmable.
Option B is used when your know the opponent has anticipated your high-low mix-up, and has decided to block correctly. In this case you can throw them.