Predators in Africa, like the leopard, usually target the weak or young.
However, targeting a warthog baby isn't a good idea when momma warthog is around--as the leopard in this video found out.
By the squealing of the young warthog, it was obvious that it was in trouble, and that squeal set off the adult warthog.
Watch it again. The warthog isn't satisfied with simply going at the leopard. No, it gets a running start in order to make the greatest impact.
Many wildlife videos show the predators stalking and making the kill. In some cases, however, either a bigger member of the herd, or the intended meal, stands up to the predator and sends them packing.
Just like the leopard in the video, which displayed its speed as it ran away with its tail between its legs.