How to create a Trigger of Dota 2 Silencer's Stolen Intelligence?

[Purgatory]

"Silencer will permanently steal 2 (4 with Talent) intelligence from any enemy hero that dies within 925 range or is killed by the Silencer."

I've been trying to create similar ability that give bonus attributes to a killing hero but, only if the hero themselves kills the enemy hero. Any ideas?

 

[Idaero Ace]

roughly like this. i dont have warcraft anymore soo...

crappy text

event: unit dies
condition: dying unit is heroes
action:
if
killing unit type is x and
unit range between kill and killed <925
then
modify attributes substract (dying unit)
modify attribute add (killing unit)

actually you can put all if on condition, or put all condition into if

 

[Purgatory]

Correct me if I'm wrong, instead of create condition of Killing unit does it will be more effective to just create a condition of unit range between kill and killed?