Inquisitor - Holy Anger

[TedEBearNC]

The Inquistor had the ability "Holy Anger" which says the following:

"Gives the Hero 5 - 10 points of Rage, blesses the target and provides it with the 'Holy Anger' ability. Decreases the combat perfomance of undead troops."

How does this work exactly? I used it on one of my Swordsmen troops and saw the bless animation but it didn't give it any other ability like the "Smashing Blow". Is it some kind of buff instead?

If you cast in on enemy undead to decrease their combat, presuming you can as it gives the targetting reticle if you mouseover one, do they receive the ability or buff or just the penalty?