How Gnar actually got to the League

He was found by Rengar in his lore but it doesn't tell how he acctually ended up in the League. I wrote how i think it happened.

After the beasts rage had subsided he retrieved the boomerang from the tree where I had lodged it. Knowing this was the beast I was tracking I couldn’t let him get away because no good hunter loses his mark, but at the same time I couldn’t kill him. The yordle was a hunter, maybe I could use him as a valuable resource like a hunting dog. I picked him up and asked him his name but all he could say was gibberish but he liked one word in particular and that was his name, Gnar. Even though he was a great hunter his methods were unorthodox. He used his preys head (or mine for that matter) as a jumping point like a trampoline, then killing his target by impaling it with his boomerang or slitting its throat with the sharp edge he was ruthless even more so when he was angered then he would just throw it at a tree or crush it with his bolder or fist. But for some reason he never turned on me, I knowing he could easily remove my head or snap my bones, he was loyal and a great hunting companion. We killed, we feasted, we got paid for great marks none ever proving a challenge for him, he was pre-historic but he adapted to the new world fast. I could never completely understand this yordle for even when the summoners called me to the league he still wouldn’t leave my side he fought next to me on the fields of justice. We made a formidable team slaughtering all prey that crept in our path.