User blog comment:Miskos3/Fairy Tail Wiki in the Anime vol. 1: Fall 2015/@comment-5303512-20160112034657/@comment-5303512-20160112064745

I've known Meliodus was not human from the beginning since he doesn't age normally. And all those times the markings appeared, I am no fool for not noticing, he has monstrous endurance. Meliodus and his comrades were clearly out matched by Hendrickson who was 70x more powerful than any of them, that move Revenge Counter was only done after Hawk had supposedly died, where it was an effort that was only able to pay off with the aid of his comrades and allies because Hendrickson sure as heck didn't know about this. If it was different like say he used revenge counter by continually hurt himself to gain the power necessary to win then that wouldn't be Nakama power.