Unit Specialization condition will properly work with your focus IF the focus unit is one of the 3 things Unit Spec can work with, IE player/arena1-5/battleground enemy.

The current explanation does not make this distinction, would be nice for other players if this was added. I assume this works because I guess instead of it considering the focus a separate unit entirely, it in a sense "copies" the unit from the original source and refers everything to that one unit.

Posted by CurseForge user Jalopyy | Imported from CurseForge issue #1594 | Raw

Seems correct to me:

This condition ONLY works for:

- Yourself
- Battleground enemies
- Arena enemies

If your focus is a battleground enemy, it will work. The description doesn't mention any specific unitIDs - it only describes their relation to you.

Posted by CurseForge user Cybeloras

Fair enough. I assumed focus acted as a separately referenced unit entirely, until I discovered this by accident. 

Posted by CurseForge user Jalopyy