Oh you mean when I did it the second time at the end?
Yeah, if you are on a small platform it will just travel that plane. It is deadly(for both parties) when you use it in the air. Most people have figured this out and stay in the air as much as possible when he grabs the smash ball.
YOU FUCKING FIFTY YOSHIS I SWEAR TO SHIT!
Buddy and I cleared out all the 2 player events from 1~13 on hard EXCEPT FOR FUCKING FIVE FOR FIELDING FUCKING FIFTY FUCKING FLUTTERY FUCKS.