Roosters aren't a bit scared when they attack. Their being dominate and it's just their natural instinct. I read somewhere that a rooster has the highest testosterone level of any animal. When they crow, it's a warning for all other males to stay away, or there will be a fight. I don't mind my rooster protecting his girls. In fact that's why I got him, to watch over them. I expect him to be upset when I catch one. He's not tame to the point of petting him, but I think he knows not to mess with me because I've shown him it won't work without harming him.