Not one of my prouder Zetas, but hey, I have her at R6 and I was trying out a Rey, L3, BB8, R2, 3P0 team in arena for a while so her Zeta made sense in that lineup... but it doesn't work... at least, ...
It should work the same way as Savior: as your character "passes/hits" the 1% threshold it kicks in. You don't have to exactly hit 1%.
You could hit a character with 600k damage, and if Savior hasn't been triggered yet, it will restore them. That 600k for sure would have deleted them otherwise, not just simply "reduced" them to 1%.
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