The Desert Botanical Gardens are always buzzing with Hummingbirds. This time of year, there aren't many distinct males, and many females look similar. While identification is problematic, their antics are still fun to watch. I believe this is a male Broad-Tailed Hummingbird with a female although the female seems a bit small (relative to hummingbird standards).
Since Pops and I were originally looking for a reported Yellow-Breasted Chat (not seen) in the area, my camera was on the aperture setting, which allows for a better, concentrated focus. The hummingbird activity was thus shot at a low shutter speed, though in decent focus--hence the blurry wings. It didn't turn out too badly, but it shows the trade off between focus/lighting and shutter speed.
I'm not sure if they were arguing or flirting, but it was pretty dynamic either way.