Is This Considered a Fumble?

I made a post a couple weeks back about being able to keep up with my brother's football games thanks to photographer Allen Greene's website. Imagine the look of shock/horror that spread across my face for all of 2.2 seconds when I clicked "next" and this photo appeared:

Yup, that's my brother...#78, mooning the entire field in mid-tackle. After the 2.2 seconds of shock/horror passed, I laughed my butt off! Don't worry, when I called him to tell him about it, he was already aware of it and was laughing about it too. He's such a good sport!