Managed to make a pegasus fly without flapping its wings. No, I don’t know how to recreate it. I believe this has to do with the animation of the idle playing the moment you start to take off.
You can do this if another animation happens while in flight. A good example of a animation canceller is the candy shower moveset. Try it. You can even use other animations mid-air too while it is broke, like dancing and waving.