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Luffy used FS to avoid Bagua and other attacks Kaido threw at him or did you skip that chapter?
He also used it here to hit Kaido with Snakeman until he had enough and used it himself to avoid Luffy's hits:
He also used it here to hit Kaido with Snakeman until he had enough and used it himself to avoid Luffy's hits:
After that he is just normally dodging like he always does in fighting while Kaido only used FS to dodge Snakeman that wasn't even hurting him.
Luffy is not using FS to hit Kaido. That is nonsense nothing on panels shows that.