Two warning shots should be followed by the guns (fortunately two in this case) being kept trained on the animal in question.
As a traillist I would have liked her to be killed immediately once she continued to approach!

NUMEROUS animals have been killed on trails, as a "safety first" option, which makes sense to me...

Consider the other option of tourists getting killed...

Just my opinion, and Good Luck Rudi!
Anyway, here's today's media report:
Lion fighter tells tale
by: André Bakkes
10/17/2008 9:54:00 AM
NELSPRUIT - His life never flashed before his eyes. On the other hand, the faces of his family did.
"I wondered whether I would ever see my wife, Lin-Mari, or my children Ruben (3) and Nadia (seven months) again," recalled an emotional Rudi Lorist when Lowvelder interviewed him in Nelspruit Medi-Clinic on Wednesday, just five days after he survived a lion attack while on a wilderness trail with hikers in the Kruger National Park (KNP).
Rudi now joins an elite group of people surviving a lion attack, and every day that passes will forever be a gift to him and his family.
For someone who fought for his life against a lioness trying to protect her cubs, Rudi looks reasonably unscathed, but when one listens to his recollection of the ordeal, the point hits home.
He explained how the group tried to maintain a safe distance from the lioness and her cubs once he first spotted her. "We tried to give her a wide berth, but as we disappeared from her sight, she attacked me."
It took only a second for the lioness to charge towards him, baring her claws and huge fangs. This was probably the longest second of Rudi’s life. He fired off one warning shot at the advancing animal and saw it leap towards him undeterred.
"I sidestepped the lunge, turned around and saw her winding up for another attack." The lion jumped towards him again and with the feline suspended in the air above him, Rudi was certain his days were numbered. Yet, he survived to tell a tale of anguish, self-sacrifice and fortune.
"At that moment, I was certain that I just walked my last trail," he continued. "I fired again, only this time the bullet shattered part of the lion’s jaw."
The furious feline landed on him with her giant paws and he went down under her stifling weight. While she sank her one remaining incisor into his flaying arms and inflicting deep cuts with her claws, Rudi screamed for the assistant ranger, Phillip Gumede, to intervene. He was already ensuring the tourists’ safety.
The lion finally left Rudi alone, but her attack will forever resonate in his mind.
"A lioness with her cubs would often frighten away potential dangers, but it is extremely rare for them to go on full attack."
In fact, the odds of being attacked are almost as slim as surviving one. One might rightly wonder whether this ordeal has put him off his job, but the answer is an assured, "Definitely not!"
"I can’t wait to get back to the park and do what will always be my passion," he concluded before adding with a smile that he still loved lions as well. Rudi was disscharged on wednesday and will start working again in six weeks.
Good wishes from all over the world swamped SANPark’s website since the incident and at the time of going to press there were already 154 posts.