Bouncing ability?

[TheBigMetalHandInTheSky]

I want to make a bouncing glaive attack that hits 3 targets and then the projectile returns to the caster (like the spell shown in this video:

). How could I make this in the trigger editor?
If variables are given, please show the type of variable (e.g. Unit, Boolean, etc.) so I can create them correctly!
Thank you!

 

[Assassins-Creed]

This is a spell request, from what I can tell. You should try the Requests Forum.

 

[TheBigMetalHandInTheSky]

Okay, sorry.