[Gameplay] Sion Decimating Smash Casting Backwards

No video evidence atm, but I have now done this three times without entirely knowing how. The animation channels, then finishes with me casting it backwards. Literally sion turns around and the people in front of me aren't hit. This happened in a ranked game(cost me a dang kill too) and pretty much everybody fell out when they saw it. Not only that, but if I actually did figure out how to do it intentionally it would be rather exploitable.