Well so much for the old wives tail that trees, brush, and bushes are an effective deterrent against hawks. Hawks don't just drop out of the sky like an ICBM to attack your chickens. They normally perch in one of the trees or bushes to "case the joint" before selecting a target. Hawks are also very adept at using brush, fences, hedges, fence corners, and in the video below the coop itself to hem up or corner their prey before they rush in to make the kill. This is why so many of you post about seeing hawks sitting in trees and seemingly scoping out your chickens, they are in fact scoping them out. My condolences for the loss of Jupiter.
Here is how hawks normally make a kill.
That was both horrifying and educational. Oh that poor little thing. What a sad sound. Thank you anyways, for reminding us that this is what we could face.