After Goku has gathered enough energy, he throws the Spirit Bomb towards the opponent. Then, he uses Instant Transmission to appear in front of the opponent and hit them in the face with a Blast Fist uppercut before teleporting away. The powerful punch delivered by Goku distracts the opponent long enough for the slow moving Spirit Bomb to successfully hit them.
Even though it was previously stated in Dragon Ball Z: Super Android 13! that Goku is unable to use a Spirit Bomb while in Super Saiyan form (because its malicious nature makes his heart no longer pure), he seems to have no problem performing this variation. This can be explained as Goku is seen as a Full-Power Super Saiyan and therefore the transformation does not alter his pure heart.