Diseased Bird: Sharp-shinned Hawk window strike

This Sharp-shinned Hawk flew into my kitchen window while trying to capture an Eastern Bluebird that was feeding on live mealworms at a feeder that was attached to the window by suction cups. I had been watching the bluebird, looked away for a moment, and was startled by the loud thud. I looked up and saw the hawk’s feathers flying. I looked out of the window and saw the hawk lying on the ground cover under the window. I took this photo, then opened the window to get a better shot, but he flew off, apparently unharmed, when I leaned out of the window. He hit the window really hard and I am surprised he wasn’t killed by the blow.