Thanks for all the replies!
Yes CamFan, it is a unique position for an egret, and it was a unique experience for me. This particular egret was at one of his usual spots. It was near sunset, and I was approaching from a good position. I was still a good distance from him when he came out from behind some underbrush and alerted to me. I was standing very still with the sun directly to my back.
When he took flight, I thought it was just another typical encounter with him and that he was flying away. However, this time he flew directly toward me. He was flying into a headwind. He then spent a full minute flying back and forth, in front and above me, looking down at me. I suppose he was trying to figure out what I was. I took 50 shots of him, and this was my favorite mainly because of the clouds.
Here's another shot of him. It's cropped a little more than the first, but I really like how his eyes are looking down at me: