Ah OK I found some of the Hallie shots. Not the static ones but the same day as I did the static ones. Still these all should have been metering off the same thing.

All three are in aperture priority.
In the first one, aperture is f/4 and shutter speed is 1/2000. This is how I would expect this exposure to have looked. It'sa bit too bright for hte background but just about right for Hallie's dark coat.




In this image, the aperture is 1.8. This has caused the shutter speed to go up to 1/6400. It is darker than the image at f/4, but being a wider aperture you would think it would be lighter.



And at this one, the shutter speed has now gone up to 1/8000. The image is way too dark. On a bright day, with a super wide aperture, using aperture priority is giving me a really dark image. The only thing I can think is it forces the SS TOO high, causing too dark of an image. If I had shot this in shutter priority, the exposure would have been dead on. There were other images of her sitting still in the same locations and lighting, that I couldn't find, where the image is so dark you can barely make her out.



Thusly I am afraid to shoot aperture priority for action, but I still don't know why and I've researched this thing til I'm blue in the face. ARgh.