Other situations do not appear to apply when it comes to adult chickens taking on a raptor. I have had chicks take on one that is outside scope of what I typically see, but they may indicate something hormonal at play with chicks reared by hens.
The chickens are pretty good identifying raptors based on species. They can even ID intent, part of basis behind calls science missing to date. Research is far from complete. I takes time to observe events that may happen once in a lifetime for chicken or even less often than that. They may even be able to ID individual hawks s based on what I have seen involving Coopers Hawks working my barnyard. Thread on that somewhere. Some Coopers a definite threat to juveniles while others are safe to dust bath next to. The alternatives can visit in same day.