Vault of the Variants Side Quest confusion: Heavy not removing defender's Protection



I read through these nodes thoroughly, and still hesitated to post just in case I missed something. If I did, can somebody please point out what I missed?
Doesn't the node say Heavy attacks will remove Protection, or am I mistaken?
In this fight, I used back to back heavies, yet neither of them were removed. I did this fight twice. In the other, the defender started with 2 Protection buffs, but the node doesn't mention that defender will start with that many, or gain any from a timer or an action. So why did it gain an extra protection buff?
2
Comments
It’s really not hard for a company this big.
Try harder.
This should make it clear. There are two protection passives
One for heavy
One for specials with prowess.
Hope that helps