How do I cancel the knockback from aerials with aura sphere canceling?

[Searingarrow]

I noticed this is a huge part of iPunchKidz's gameplay and I feel like that's the next level of lucario play I need to learn.
Can anyone explain how this is done?

 

[Risky]

You have to hit them with the charging hitbox of your ASC. So basically be inside of them with whatever attack you're using them cancel.