It takes very precise positioning to make the boost be horizontal rather than vertical.

However, your speed will decrease slightly each time. If you are able to achieve a boost like this, you can preserve it longer by landing on the ground and pressing ^A to jump without sliding. And, once you're holding the clancer, you're in a difficult situation where you can't grab new objects or boost grab without dropping the clancer, thus losing all of your speed. For Clancers, the boost does not work horizontally unless the Clancer has been damaged once, and lives (doesn't get ghosted.) Most clancers die in one hit anyways, and it'd be slower to hit a clancer once, then do it again to try and get a spikeball boost. This is in 4-07, where the boost is attained for about 2-3 frames before the pot is thrown.

Only 1 stage in the current S rank run has a situation where you hold the pot and get the boost.

You can get boosted horizontally for greater speed, or vertically which shoots you straight up. A very interesting property of the spikeballs is that by holding an object in front of you, you can get a significant boost if you make the object hit the spikeball in a specific spot.

Mischief makers