While the circling pride had every advantage-size, numbers, top-of-the-food-chain status-the would-be victim had a combination of some serious tail-shaking (called a “rattle”) and impressive fearlessness, and the porcupine was helped by a general reluctance on the part of the lions to take a face full of barbs.

Kruger's daring leopards a match for porcupines? - Wild Card

Leopard ends up with a porcupine's quill up its nose after trying to eat  the spikey creature - but it soon gets its own back... | Daily Mail Online
That all kept it alive and off of the dinner menu.

A VERY prickly customer! Leopard left with quills sticking out of its paws  after hunting porcupine | Daily Mail Online

As you’ll see, contrary to common belief, porcupines don’t actually shoot their quills, but that clearly doesn’t matter much in confrontations like these. Per Beaumont, “if the porcupine manages to get close enough to a predator, it does not shoot its quills, as many people may think. Rather the quills have micro-barbs, which hook into the face or paws of a predator that may get too

A VERY prickly customer! Leopard left with quills sticking out of its paws  after hunting porcupine | Daily Mail Online

In addition to quills likely being exactly as painful as that sounds, quills can break off, leaving parts embedded in the skin of the predator and often resulting in major infection. Apparently, that was ample motivation for the lions to ultimately retreat, stomachs empty.

Leopard covered in quills after attacking porcupine : r/natureismetal

thanks to those long and sharp porcupine spines, which scared the opponent to do nothing about the hedgehog and had to leave with an empty stomach.

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Source: https://newonlinenews.com