Tenacity vs Potency how to determine it's applied?

Also, Jyn has stacking potency with her unique. "Jyn gains 10% Potency each time she scores a Critical Hit."

Another point to add to the Pot vs Ten calculation is Tenacity Down cannot be resisted and will give all debuffs the max 85% to apply. (Although it didn't affect this battle, I figured it's worth adding)