Whoa! That was CLOSE! I counted four shots, as some people have said, three before the cat got to the vehicle, and one as he was running away, which took him down.
As Jerome has noted, there are no visible wounds on the animal from the shots as he charged. I only saw dust going up around him as the shots went off. I think he simply turned around due to the noise. Wonder if the guys who were shooting had any kind of cage or something that might have caused him to pause as he did (or she, can't tell what sex the leopard is).
If nothing was there between them and the cat, then it appears to me these guys were EXTREMLEY lucky he/she decided to abandon the attack. Otherwise somebody would have been torn up pretty badly. It appears they'd shot their wad and had no chance at that point to chamber another round -- this is where a pump action comes in mighty handy!
In the slow motion you can see there are no marks on the animal; no blood anywhere, which suggests they were all clean misses and the only shot that made contact was the one that took the cat down as it ran away.
By my reckoning, those guys had MAYBE four feet between them and the cat at the point it turned around and ran off. That's probably as close as anyone has ever been to a wild cat without being injured, wouldn't you say Jerome?