Enemy Spread In Collision

I need help asap! If I shot my enemy, how I can make it to spread into small pieces?? Just like this gif attached.

 

Big enemy:
If collides with actor's bullet, add debris explosion node (Total value is 2) and asset is medium enemy.

Medium enemy:
same logic. If collides with bullet, debris explosion creates 2 small enemies.

Small enemy:
If collides with bullet, remove.

 

Thank you so much!! Now, I'm trying to get them to explote (spawn) Can't find a solution.

 

I made little template for that. Thanks to @LBPToo Oscillate node!
Download link: https://www.hanomaxgames.com/Downloads/asteroids.bbdoc

 

So helpful!! Thank you!!