User blog comment:Roranoa zoro/Defeating Logia users without using Haki/@comment-3202520-20130706115515

I think the speed thingy is totally possible, even thou I don't think Zoro did use speed or haki to beat monet.

She didn't bleed from Zoro's attack, she was petrified by fear, zoro's attack scared her so much she wasn't mentally stable enough to reform properly.

But back to the subject of speed, Crocodile has said he can turn into sand as a reflex, and reflexes still have a speed they're not like teleportation, instantaneous, so seeing the average human reaction time is 150 to 300 milliseconds, if an attack were to move faster then that I guess haki would be useless seeing you could just punch someone before they change into logia form.