Listen and listen carefully heres how I analyze things. Based on the situation and based on the spoilers.
Everything that was said about the eyes on the back thing about the 3 sisters was hear say, do you understand me? there was no proof because no one was brave enough to look at the back of the sisters so no amazon woman from the island actually saw the back of the sisters.
Now look at the last spoiler pic, luffy saw the back of boa but he did not turn to stone! And notice that Oda didnt show us the back of Boa on that page of the manga! Clearly a twist is at hand. Looks like
luffy saw something that Boa is hiding. Therefore Boa will be in debt of Luffy in one condition, luffy will hide whatever he saw. DON!!!
Hahaha im about 80% sure on this one.

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