how do i make a "Poofer" ?

[giacomo9]

I want use this script: void SetEnemyIsHallucination(string& asName, bool abX);

But I don't know what is "string& asName" (It must be "Player" or enemy name?)
"bool abx" is the distance, I know. In quotes I just must to write number?

Or, simpler, can you write a example of this script for me? Thanks