normally a male would display this behavior, but you will see females jump up and flog at each other.
if they are getting close to sexual maturation, the hormones will cause your cockerel to suddenly have the urge to protect the flock, to be king of the hill etc. you may find him charging at you, dropping his wings at you and even flogging at you.
he may even look quite confused after doing something like this, as if to say, "why did i do THAT???" it's just like a teenage boy doing crazy sports like jumping off a roof or skateboarding down a set of stairs. they just don't think.
watch when you turn your back on him. turn backwards and walk away. if he does charge, drop wing, flog etc, charge RIGHT BACK and yell at him. YOU ARE TOP DOG in the flock. not him. just run right back and kind of yell in his face. it doesn't matter WHAT you say, just say something very sternly and get into his face. if you have to, give him the BOOT! a good swift kick to move him away. (it is what another cockerel would do to him.) he will learn to respect your space.