Thanks for adding the clarity to it. You're correct on it being a refund and the reason I was saying "bonus hit" is because with some jobs they give you that highlight around abilities when a proc occurs, which is telling the player to use the skill. In reality they are using it with DRK and TBN to help make sure the player cashes in on the refund, and the timing of the refund varies with how aggressive the monsters are in dealing damage to the player.
None of the other tanks have that kind of situation occur. They mostly are concerned with using procs when they need to in order to reduce incoming damage. With TBN a player can get punished for things outside of their own hands, like a mob getting stunned or deciding to use an AOE that is dodgeable. Since they changed this to "mitigation matters", it isn't advisable to stay in advertised AOEs even as a tank most of the time, though in Shadowbringers you could do that to help assure the proc triggered.
