Actually read this before commenting.
I think that shoulder charging out of a slide is ridiculous. Also in mid air. To shoulder charge you have to be running, not floating or sliding. It just doesn't make any sense and shouldn't be in the game.
Edit1: It's not the midair SC that bothers me as much as it is the slide
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I accidentally slid shoulder charged someone once. I didn't know it existed, but I've never felt more dirty except when using MIDA 1-KYS in Trials. The mid-air is okay, because it obviously is intended to be in the game. Or else Peregrine Greaves would work on the ground, one hitting supers every time they even breathed. It would get SC destroyed.