User blog comment:Matt Hadick/Super Smash Bros. for Wii U and 3DS Tips and Tricks/@comment-1329399-20141215141644

Kirby: When opponents are right next to you and have over 80% damage, use his down special on the ground to push them far away. The higher the damage they have, the farther they'll get pushed. Be sure to be careful, because if they aren't close enough, they will have a chance to grab you.