Another one of those, is this the expected interaction.
What you were expecting to happen, and what actually happened?
I was expecting that a Priestess giving a damaged Paladin protection would raise the maximum armor so that "reinforce " on the paladin would continue to heal the armor.
What are the steps to make it happen again?
Have a Paladin at say 20 armor. Get it damaged for 5 damage. Notice that reinforce triggers the next turn. Then use protection, for say 10, on the paladin. The new current armor will be 26 (20 - 5 + 1 + 10). Notice that on the next turn reinforce does not trigger. So I assume the Paladin’s maximum armor stays at 20, and does not rise to 30.
This may also occur with Templar’s ability, but I have not yet tested how it interacts with the Reinforce Trait.