Sometimes we get to see in MMA if you fight with your feet or knees and elbows you can at times get away with opening your front foot up and going heel to toe which opens your hips and direction to catch them with a rear kick or knee, all depending on how over committed they are and which direction they are headed ,so then you catch them on their pathway;

That would be a big mistake not to correct the rear foot or just lead out with the front only when boxing.

Even in Mma unless you change the direction of attack after slipping like that and meet them where they are heading for with your rear leg or arm you'll get caught out in a wide stance,off balance, facing the wrong way as well.

Another rare way we sometimes see is to pull your rear foot right around behind and out on an angle, adjusting your front foot last and attack them with your front leg controlling them with your front arm but thats rare and best done off a standing grappling fight for balance and control.

Those more rare angles you see used at times can only be pulled off when you are setting them up off their over commitment.