This is badass! I like that the stages repeat. There's another Spidey float way in the sky :-D
How is this even a glitch? Sometimes your character gets knocked off-screen, and if you get hit while off-screen then the camera pans over to show it. The effect is just greatly exaggerated in this instance because the ball hitting from beneath knocks them upwards, and the pillar seems to have a huge vertical distance. Seems like a normal feature to me.
#19, nobody asked for an explanation. Enjoy the glitch.
Really weird glitch. Though, I play Dormammu and never have seen this. Must have tried to use this as a punish and that's how he figured it out. But I think this would be a weird scenario in the first place to actually come across this glitch.