[Ironhawk]

Whoa! Thats actually pretty bad. Holy avenger could become like a "poor man's smite" if you can set it off with friendly fire and have it kill enemy units. Whats to stop you from repeating this scenario you've listed indefinitely? And furthermore outfitting your queen (or whatever unit) with a cold resisting item so they only take a minor wound?

Wait is Holy avenger activated by damage? or death of the unit in question? If its death then this is a nonissue.