I mightn't see it, but I'm pretty sure I would hear any ruckus. I usually hear any scuffles that go on because the hen house isn't that far from my living room & we keep all the windows open in summer, when my lot tend to go broody. Of course I still might have missed it but given how often I have a broody surely I'd have seen something @ least once...?. I am only going by my observations. My regular broodies are big girls & high ranking. No~one messes with them but they seem to have set the standard; Broodies get left alone. Their status may shift when they rejoin the flock but a sitter is left to get on with it.
My 1st broody, when I had no idea what I was dealing with, was really aggressive but I refused to be intimidated by her & not only has she never been aggressive with me again, none of the other hens have either. I can remove eggs & shift a sitter with no more than a lot of squawking. No pecking. No wing attacks. I am fascinated that others have different experiences. I find broodys frustrating because I can't let them sit, but I don't see really aggressive behaviour, just the fluffing & squawking & doing everything @ zoom speed. Otherwise they are pretty chill. The hardest part for me has been getting them out of their trance long enough to eat, drink & dust bath.