Hidemasa Hook

I get the whipping motion and how the trick works, but whenever I try to whip the string at my finger, it ends up in a laceration. Please help.

make sure the yoyo is like a centimeter from ur finger when you whip it that will make it easier for the loop to go under your finger and not around your finger landing in a laceration also move your whipping hand(th) closer to ur pointer finger it will help guide the string. hope that helps