I know that his image is well suited to spark your imagination on what might have provoked this vicious facial expression. Was there a rival approaching him, trying to conquer the king's female? A little argument that the king was just putting to an end? I hope you have a good time coming up with good stories to illuminate this story's background. Rest assured that you don't have the slightest chance of finding out what was really going on. :-)
To make your confusion perfect, I'd like to point out that this is the exact same lion as this one here and this shot has only been taken about 40 seconds before the other one. Good luck! :-)
On a technical note, I couldn't contain myself and applied some selective coloring on the eyes again. I think the facial expression cried for it and it adds so much more dynamic and power to this shot.
It's a shame really... dislikers on the loose again.