That is a pretty good depiction of what it was like when I had pigeons. Hawks would swoop right past me as I was turning to see what was the alarm. The predators are desperate and reckless. Young stupid hawks should be trimmed. They should not be hunting chickens. They should not be sitting on fence posts or tree branches, or on top of your coop salivating, watching your birds. There are too many of them (which is why they grow desperate and hunt chickens.)... Roosters are not fail safe either. I interrupted a Coopers hawk wrestling with my good sized BC Marans rooster. i don't know if he jumped in to save a hen or if it attacked him first off but he was entangled and I believe he was not winning. If hawks are swooping right past you to get a chicken, they deserve whatever they get. I clip a few here and there every year (many more when I had the roller pigeons) and nonetheless, by the end of the year, the songbirds are decimated, the remaining hawks are gaunt and desperate, and my chickens have to be kept in because I cannot stand watch over them all day. There are way too many of them, and I offer the increased predation people are seeing as the evidence.