The problem is if they swoop down to grab prey on my yard, they can't get back out because they need their full wingspan to get back up with the prey or they'll not be successful in getting their prey.Apparently you haven't seen Ellie.
I have fencing all around their free range area, they can try to make it out but holding a chicken and managing through fishing line is one task these hawks don't want to do. They've found easier food sources