This bull was significantly obstructed and facing away as it thrashed an alder, providing poor photo opportunities. So, planning for its next move became the priority.
The bull had moved away from a cow to threaten an opponent, so, logically, it would go back to the cow. If that option was chosen, the bull would most likely come through a specific opening, and positioning for a supporting background behind that opening became the plan. That optimal position included getting low to ensure most of the close, in-focus foreground was out of the frame, that the mountains were prominently included, and that the catchlight in the bull's eye was enlarged (reflecting more sky).
As predicted, the bull came into the opening, and better than expected, it stopped to provide a variety of poses.
The Canon EOS R5 Mark II and RF 100-500mm F4.5-7.1 L IS USM Lens are an outstanding combination for on-the-move wildlife photography.
A larger version of this image is available here.