I have learned that our humming birds are not unique in their "fighting", but it does not make it any less comical to watch. We have one male, we call Napoleon, that sits atop the feeder "watching" for anyone else coming in for nourishment and attacks them in flight!
Nice shot Gary... You got it right... quite a few years ago I put a couple of GoPro cameras on the poles holding the hummingbird feeders... it took a lot of editing to put together a short videos and I titled it Food Fight.