S23B boss stage 2 may be completed by any unit

[irydacea]

[Spoilers below]

Because of a change in commit 624d574 that allows non-Union casters to deal reduced damage on the enemy boss, it is possible for any unit to reduce him to 0 HP or less, ending stage 2 and advancing to stage 3.

The argan absorb damage event handler in S23B does ensure that he's always above 0 HP at the end of the attack sequence, but this doesn't stop the game from triggering the death sequence anyhow. If AtS is any indication, we should be detecting this corner case in a last breath event and canceling the death sequence there instead. It does raise the question of specifically what we should do in response, leave him at 1 HP, or regen a fraction of his HP bar like in stage 3?

[Konrad22]

I'm in favor for leaving him at 1 HP, because, while those attacks can't kill him, they certainly can't heal him either (or make him regenerate somehow). I'd say 1 HP is a better indication for 'I'm almost dead, but the final push is missing'.