Pushback Attack

Pushback Attack

I was wondering if anyone can make a spell, or tell me how to make it, that is basically like this: When a unit attacks, it has a small chance to create a loud sound of thunder that pushes back a unit and it stuns the pushbacked unit for a small amount of time.

Exactly like my hero contest spell? It's fairly easy, and you're supposed to request spells in the spells forum