When Sanji, Franky and Bonney attack Luffy Gear 5 Balloon to sent Mars flying, Luffy asks them to give their best move then he says he is feeling pain because "You guys are using Haki" when Bonney asks why he is screaming
The point of the Dawn Baloon was to accumulate enough potential brute force through Sanji-Bonney-Franky attack to send Mars in the space, haki wasn't necessary.
The lengths you have to go to to cope.
You must be the consequence of multiple generations of inbreeding.
