The heron just grabbed the unlucky rodent — I think a pocket gopher — from his hole. The gopher is literally peeing himself with the heron’s lower bill stabbed through his back. The heron is in the process of shaking off all the plants before taking his prize off to be swallowed whole.
Nikon d850 on M program at 1/1000th, f/7.1, and auto-ISO at 140 with the Nikon 500mm f/5.6e PF, handheld. The photo is cropped down from 45MP to 26MP for an effective focal length of 920mm. This is a JPG off the camera with a little cleanup in Lightroom.