So I'm asking this question especially because of Durin's Bane in the Shadow and Flames scenario. He regenerates 3 damage in the refresh phase before there is the action window for player actions (and with that the opportunity to use the Dark Pit action). So if I want to use the Dark Pit action in this or later rounds after damaging Durin's Bane it would be nice to place more damage then 27 (his HP) on him.
As an example: Durin's Bane hast already taken 25 damage and raging Gimli swings at him with 8 attack Durin's Bane would normally take 5 damage. Now will there be:
a) 30 damage on him and after regeneration he would still have 27 damage and by that making me autosucceed if this stays the same until I use the Dark Pit action?
Or will it be
b) 27 damage on him (because this is his max. HP) and after regeneration he would have 24 damage so that I still need cards with combined costs of 3+ to succeed with the Dark Pit action?
My guess is b) because it's worse for the players which normally is the right case in such situations and also the wording for Indestructible in the Shadow and Flames rulesheet is "...even when it has damage EQUAL to its hit points" and not "...even when it has damage EQUAL OR HIGHER to its hit points".