Dummy can't impale multiple targets at the same time

[MN Lahmar]

Hello, why is the damn dummy unable to impale multiple targets at the same time? It works fine with other spells like Death Coil, Sleep, Storm bolt...
Check the map below.
I want it to impale every single unit ( dummy casts impale on every unit separately, i don't want it to impale the region around the caster).
If you find a solution repost the map pls.

 

[BloodDrunk]

Just post the triggers for your impale.

 

[WaterKnight]

Impale is a channel, casting it instantly does not work well. Use multiple dummies instead.