Slash Extension is a trick that increases the size of the hitbox of Link's sword attacks. It works with Swords, Deku Sticks, and Hammer. To perform the trick, pause during the triple slash animation then pause repeatedly without allowing a frame to advance. This causes the hitbox to increase until the upper limit is reached.
There are 5 types of attacks you can extend:
-Horizontal Triple Slash
-Vertical Triple Slash
-Right Triple Slash
-Forward Lunge Triple Slash