Interesting point. Hold Person specifically says the person can't speak, not to mention that being paralyzed means they can't take any action at all (but are specifically allowed to breathe). It could be an artifact or houseruled feat which allows speaking while paralyzed, though.
Not to mention that Cure Paralysis has a somatic (hand waving) component, though preparing it with Still Spell would make sense for such a situation.
Although were I running the game, letting Kore cast would be a not-fun option. But that's just because of my group - enough of us know the rules well enough to expect that Hold Person would lock him down unless he made the save, so breaking that expectation to let my antagonist keep on truckin' would've been shutting down player agency (especially since, if Kore is a paladin, relying on a failed save is a huge, huge gamble which should be rewarded, if anything).
That's something weird I noticed: Paladins don't actually have good will saves. If Kore is level 10, his will save is a mere +3 (plus wisdom modifier, plus *charisma* modifier because of "divine grace" class ability). That's likely to be around a 10 assuming his charisma and wisdom stats are actually high. Forgath's hold person spell would have a DC of 12 plus his wisdom, so probably at least 15. That's roughly a 25% chance of success, not too shabby against a target *6 levels above him*.
Of course, Hold Person has apparently been nerfed in this universe, but Forgath prepared it without expecting a divine spellcaster.
In this universe, creatures get a stackable bonus to wisdom as they age, Kor being the last of the Greyhill paladins may be as old as the Axe of Prissan, centuries old, and thus have a tremendous wisdom modifier. Maybe.
That would only make it weirder that Forgath's spell worked at all, though, unless the houserule is that there's no initial saving throw. Which would be... really something.
The whole situation is so weird, from a mechanical standpoint. Forgath casts Hold Person and Cure Moderate Wounds before Kore acts. The Hold Person somehow affects someone with a good or possibly insane will save. Kore somehow acts despite being paralyzed...
It's pretty cool looking though, and I don't actually mind the mechanics oddities. It's fun to try to figure them out, but I'm accepting that they aren't game-accurate and just enjoying the fight. Go Forgath, survive somehow!