I am certainly no expert on large cat behavior, but it is my understanding that the cat was more likely working to drive away, or scare away, or warn, the person that it perceived to be a threat to its offspring. I didn't see/read any indication that the cat was stalking or trying to prey upon the person.

Thank goodness it was a mountain lion and not a grizzly bear, since I've read of a number of cases where the bear will not do a bluff charge, but rather will attack and try to incapacitate (kill or severely disable, but not consume) the perceived threat.