Backstab ability

[IcatiaNight]

Hi all... Can someone help me with Backstab? I don't know how create a backstab ability that works only when the unit that has learned it attack an enemy from the back.
I created the ability as passive and i used great hit...And then i tried to create a trigger that makes that ability work when my hero attack a unit from behind but i don't know how do it...

Thx in advice

 

[Dinowc]

http://www.thehelper.net/forums/showpost.php?p=1049158&postcount=9

 

[Gtam]

Here GUI

 

[IcatiaNight]

Thx men...But i have to pay for an help? I haven't money on the net and my parents don't want to buy nothing on internet...

 

[Gtam]

No here you reward helpers by giving the +rep