Flogging is one of the ways roosters fight. It's when they fly up at you and beat you with hard & fast flapping of their wings. It can hurt, especially if you get whacked with their bony arms. They even have a little spur at the "wrist" joint.
Flogging is often accompanied by spurring, when they pull their legs forward as they jump up and try to gouge you with the spurs on their ankles as they bring their legs down firmly & quickly.
I don't know when or if they get some beak action going there too. It often happens so fast, they dash at you and everything's moving at once. It can be startling, frightening, painful, and injurious. Especially to a child. Some roos will just rush in and make one attack, then run away. Others will continue to flog & spur until you leave their territory. Some specialize in the sneak attack, waiting until your back is turned or bent, then jump up & spur you from behind.
I see no reason to keep a rooster that does that. There are just so very very many other equally handsome roosters available to husband your flock, fertilize the eggs, and sing Good Morning to the sun. I don't like when my kids are afraid to go outside in their own back yard, scared to spend time with our flock. I don't like crossing my yard with apprehension, the theme music from Jaws playing in my mind, wondering Where is that rooster? and When will he attack?
Sometimes the smallest roos can be the biggest bother. I had a Silver Sebright who was an awful ankle-scratcher. I got rid of him after he drew blood on a visitor. Afterwards, it was such a relief to go in the yard without dread, I didn't realize how much he interfered with the peace at our place.