Roosters can be VERY nasty. We have one here now that is a Rhode Island Red, he's small, prob 1/2 as big as our last one and is a terror. You cannot turn your back on him or he'll come at you, spurs a-flailing.
When we 1st moved out here to the country we got some chicks, 6 hens and 1 rooster, they're free range, and that rooster grew into a big ugly white monster who had a particular dislike for my daughter who was about 5 or 6 yrs old at the time. He would spot her outside and run across an empty field and give chase, scared the heck outa her, sometimes he would get her with his spurs. Got to be she was terrified to go out and play. So I had a talk with her and told her he seems to know she's afraid of him and that he has the upper hand, gave her an old broomstick handle to keep with her when she's outside to protect herself, to fend him off if he threatened her. 2 days later we were outside and I saw him coming after her. I yelled at her to hold her ground and give him a poke if he got too close. I could see she was scared and wanted to run, but then she decided to defend herself. She assumed a "batting" position to my surprise and when he charged her she swung that broomstick like a Major League baseball bat, caught him dead-on center and sent him hurtling into the side of the barn
. "Dear Lord, she's killed him", I'm thinking. He sat up, ruffled his feathers, and believe it or not, came at her AGAIN. I yelled, "Hit him again", which she did, same result but this time he decided to retreat and never bothered her again, though he would stare her down whenever her saw her. She got to feeling pretty tough after that and would purposefully walk right by him, just taunting him to try something but he never did.