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That's a rotation glitch I found on level 3: try to go to level 3 then run towards a mob, jump, and try to ground pound in mid air when you're about to bump into it and die, you'll need good timing though. After that, turn left and see what happens. My hypothesis is that when you ground pound, the rotation style is changed to "all around", and when you finish the ground pound and touch the ground, the rotation style is set back to "left, right", but if you ground pound on a mob while being in midair, the game will consider that you just squished the mob normally, and didn't finish the ground pound, rotation style won't be reset. It makes the game look really funny...