SMN Soloing In Abyssea

Last week i saw this SMN on Abyssea La Theine soloing mangy-tailed marvin plus he had like 10 rabbits linked , he was fighting with garuda and garuda was receiving no damage at all from all the hits all i could see was i bunch of 0s ,the only dmg was from the nm aoe does anyone know how is that evem possible ? btw i peek at his gears nothing great .