You don't need gille don't jump near it or walk normal do the mid walk and trap it and then u got 1 just don't it it. If u anger it take your argentavis and Carrie him for a bit then take him back to trap this worked for many many times btw it resets tame process tho.
When me and my brother first started playing ARK we spawned in the Redwoods on the Center by the shore and we saw one of these guys just walking around. We had nothing so we didn't have anything to lose, so we walked up to him. I guess either I wasn't close enough to aggro him, and maybe my brother wasn't either so I kept walking around and my brother was just chillin with him and all of a sudden he punches my brother into next week!