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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Not really. The charge has to be done a fraction of a second after the slide, otherwise the charge goes away.