How do you Lunge in Wii Sports Resort?

In swordplay one of the Stamps is to lunge the player off. I’m not quite sure what motion I use to lunge them off.

It seems to be tougher for the controller to read than slashes, try to just thrust it straight forward. if it’s registering as a vertical slash, you’re putting too much angle on it. It has to be straight.

Wii Sports Resort Sword Play Stamps 1 Cliff Hanger, Straight to the Point and One-Hit Wonder Stamps