I think that dedicated Bird shooters use horrendously expensive gear, usually in the 30 to 600mm range, fast lens, super unparalleled quality, fixed to horrendously expensive DSLRs then you could say this image is not to that standard, however I doubt Harold would pack that gear so taking into consideration the limitations of what he used its a good capture.
Its not easy to capture Birds in flight even with the best gear, I know cause I used to own the horrendously expensive gear and could never get a tack sharp picture of this type of subject.