Medusa-like Mechanics

[defskull]

For those who don't know what is "Medusa", it is an Ancient Mythical creature from Greek Mythology that will turn anything into stone if any creature stares at her (both Medusa and the unit must stare at each other)

Well now enough with introductions, what should I do with the trigger ?
I suppose we should compare angles ? But how ?

What I want is:
- A trigger that able to detect whether a unit is facing at Medusa and Medusa should face the unit at the same time.
- When the Unit faces Medusa and Medusa faces the unit at the same time, the unit is instantly killed.
- The angle adjustment for the stare should be +- 45 degrees since it is nearly impossible for a perfect stare for both units right ? Therefore it should have a range for the stare which is +- 45 degrees.

Can anyone show me a trigger of it ?

EDIT:
Wait I think I found something, will re-open if I don't find the solution.

 

[FRENGERS]

LoL'z you having bad at it :/ :/ ( You are spell maker, the first great spell maker!! And I like your spell ( Split Dimension ) )
Open DotA map then you will find it ( Open it with DeProtector )

 

[defskull]

I have created an algorithm and it works fine up until now, moderator can mark this thread as SOLVED.