How do I pull off the martelo do chau fling? I watched an any% speedrun and heard button mashing to get the fling. I still didn't get it. Does anybody know how to pull it off?

use martelo then press shift then let go of shift then mash a d a d a d or w s w s w s w s w s or up down up down up down up down

you want to wait until the character is as far away from its "normal" hitbox as possible, then mash A and D. if you do it right at the start of equipping the dance, the character is still close to the original hitbox and doesn't get flung

tl;dr farthest from normal hitbox, mash a and d