Khaine's Thirst boon

I wonder how this will work, ‘5% Damage Reduction for every 20% Health lost. Stacks up to 5 times’: when you lose 100% and you are downed, you get max DR?

Possibly also triggers off 20% of base max health, in which case a 20% health property might allow you to have max stacks without being downed. I also wonder if it only counts green health or counts thp as well.

Basically zealot as a boon. (when combined with the +heal and 10% hp invulnerability boons)

100% health down means…