SC2Mapster

So I'm trying to make a trigger to make a custom spell called "Shadowstep" Witch blinks you to the target unit, however, I want to add the sniper round damage effect to the target, but ONLY if its hostile.

I got it working, except that when I use it on my own units, it damages them as-well.

So my current trigger is:

Event:
        Unit - Eystanus [54.53, 14.60] uses Stalker - Shadowstep at Generic1 - Any stage (Ignore shared abilities)

Conditions: (This is what I need help on)

Actions:
        Environment - Create Ghost - Snipe (Damage) on (Target unit for (Triggering order)) from (Triggering unit)

So what condition do you guys think would work if I only wanted it to effect only hostile units (Player 15)

Variable: Untitled Variable 001 = (Allies of player 1) <Player Group> Condition (Owner of (Acquired Target)) != (variable001)

maybe like this?