If Rumple knows your name he will have a power over you. I guess he felt he will eventually face Gold/ Rumple. He did not kill August because he felt he’ll eventually die of whatever is ailing him and yet before he dies it maybe killing Gold to not know his name. It means August’s threat level to Gold in Gold’s point of view is unknown. August is one of three people who has made Rumple/ Gold lose it. Belle and Moe French being the other two. So we know that three people are able to push Rumple/ Gold’s buttons.
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