Mihawk was going all out and couldn't do shit, that is factual, bro's a bum.
If he did? Luffy, and Marineford, would both be at the bottom of the ocean. I cant be bothered to count how many slashes he threw but if Mihawk was going ALL OUT like he did with the wave slash? Luffy would be atomized and we would be reading One Piece instead of Nika-piece right now.
Which... not gonna lie, fuck Mihawk for not killing Luffy.