I have a funny story about how I learned it.

So I was in La Noscea looking for skills, and I saw someone attacking a hornet. I helped them kill it only to realize they were a BLU. Then it dawned on me they were after a skill and then I noticed a bunch of people killing the hornets. So I figured I'd go after the skill as well. So I attack a hornet. At that exact moment I get a party request, and I'm like "sure why not". So I join with 4 other people, and "we" kill the hornet, and learn the skill. Suddenly all of them are like yes finally, sweet, finally got it. Apparently, they were trying for some time and then I come along and get it no problem. If only the rest were that easy, lol.