I'm looking at the bird. I'm also giving Timber a command to "HOLD". You can't have dog chasing a bird you're about to shoot. I also had just stomped on the ground near where the bird was sitting to get him to flush.
If your look closely you can see that Timber is still focused on the bird. My guess is that Bill is focused on Wanda doing one of her "Mother Nature" poses just out of the frame on the left. No clue who took the image!
Aren't Bill and Timber supposed to be looking at the bird right in front of them, or are they just ignoring it so they can get closer for a better shot?