The mountain lion appeared at a water hole that was dry due to a severe drought. He clearly thought that prey was nearby and moved incredibly slowly and meticulously for about 30 minutes. He took each step painfully slowly, avoiding making any noise at all.
It took him almost a minute to get from that first position almost into his pouncing position. As he moved each hind paw forward, he'd inch this front paw forward so that the hind could land where the front paw had been an instant earlier. It looked like a method to prevent him from accidentally making noise with his hind paws since he can't see where they are landing.
Then, he maintained this very uncomfortable-looking position for quite a while. I believe that he was ready to pounce on an animal. He held his tail up and off the ground the entire time.
He left the view of the camera a couple of times but kept coming back, always using his silent deliberate gait.
Here's a video of this mountain lion's time near the dry water hole. Although it may appear to be in slow motion, it is not. Rather, he was moving with such stealth that he moved very slowly. Enjoy - I have never again seen footage like this, and I doubt that I ever will!