Question about two step projectiles skillbuilder

I'm finally getting a grasp on the skill builder, and I want to have a projectile that collides with terrain, then another homing projectile comes out of where it hit.

I already understand homing projectiles but could somebody tell me how to make them come out of where projectiles hit?

I suspect the collide branch if it is please somebody tell me how I could use it in the way I want to 😭 ty ❤️