Several unsuccessful Hold Person attempts against the mage has left me pondering on whether a doppelganger is actually treated as “person” under the applicable game rules…I still do not have an answer to that one.
I don't actually know, but if I were to guess, I do not think it works on them. To me, those guys do not seem humanoid enough...
Martha, level 8 half-elven Totemic Druid, advancing the plot a little
Minsc was my dedicated sneak archer in Nashkel Mines. Went pretty well overall, but a few times he needed Kagain and Martha to hold a front against swarms of meleers. We took quite a bit of damage but not more than a bunch of Goodberries couldn't fix.
Very few things went as planned in the Mulahey fight, although one such thing was Imoen's trap setting. But when I tried to move the party into the righthand room, Mulahey must have spotted us. Took me by surprise, as he stepped up to Kagain as he was passing by. Imoen and Minsc had made it into the back room. Martha and Dynaheir were still close to the entrance, and now found themselves right next to a spawned 6-pack of kobolds, with skeletons behind them. Dynaheir immediately Magic Missiled the Commando but that turned out to be unnecessary. Imoen's traps wiped out the whole pack. Put the hurt on Mulahey as well.
So far so good, but now began a pretty messy sequence. Dyna and Martha were boxed in by skeletons. They weren't dangerous to them but they clogged up the passage so our spells couldn't be used against the cleric. Still, Martha quickly summoned a spirit animal (bear) as close to Mulahey as she could, then began hacking up a skeleton that was in the way. Kagain fought Mulahey, but without success and not for long either:

With nobody to interrupt his spells (he held Kagain just when I had thought of his Ring of Energy!), Mulahey looked to the right, found two good-aligned characters occupied with kobold elites, put a smile on his face and Unholy Blighted them.

OK, that hurt but both are still more alive than dead, and now my bear is in the action. Right?
Nope.
For all their power, these spirit animals are often incredibly frustrating to direct in battles. I wish SO MUCH that the 'party AI' would be off for them as well! Bear saw that skeleton and decided it was 3 micrometers closer to it than Mulahey was, so it switched to attacking the skeleton instead. Now matter how many times I shouted "NO, GO FOR THE DUDE WITH THE SHIELD!" to it, it just refused and went back to the skeleton. So annoying. At least Dynaheir could now see Mulahey and gave him her last MM.
He wasn't done, though. Far from it. Threw Hold Person at Minsc. I moved Imoen towards Mulahey so she'd be out of the area of effect. That worked, but the next round, this happened:

Bear has smashed the pile of bones and turned towards Mulahey. Right? Nope. See the Kobold Elite that has taken up the exact spot the skeleton was in. And then there's another (the one behind Imoen) that is soon going to take that place as well. Sigh...

See how I still try to make the bear useful? Probably should just have left it alone from the start, and it could have been done with the riff-raff by now. Live and learn, I suppose. Martha had now finally broken free and started to throw Darts of Stunning at Mulahey. She used upp all seven she had without managing to stun him. Grrr! Not sure how many that actually hit, but I saw him save against the effect at least twice. She switched to dagger throwing and mixed in her innate Larloch's MD as well. That eventually did the trick but it took a couple of rounds more. The two skeletons fighting Dynaheir only hit for 10 points in total (on a critical).
A very messy fight, but we were sturdy enough that it was never any real danger.
Loot was decent, with Girdle of Piercing as the main find, and a Wand of Fire with one charge. There was an empty Ring of Energy there too. Sold for 1 gold, and it's super expensive to buy back (with number of charges unknown to me).
Nimbul was owned by Stinking Cloud. It had a fun little bonus effect, group napping:

I took Branwen to Feldepost's but once again, didn't get to see the conversation with Tranzig that I wanted. He talked as soon as Imoen peeked into the room (I wanted to scout, as I wasn't sure in which room he stays in), even though she was in shadows. He made a comment about how Branwen looked better as a stone but she didn't answer. She was on the floor but not in line of sight. Was that the problem? Or can't the protagonist be downstairs? Anyway, no matter who talked to him now, he 'had nothing to say.' So no converstion at all, not even the original one. Force-attacked him with spririt summons to solve it.
We had rested before Tranzig, and when we went outside, Molkar's gang showed up. First time I meet them before the amazons. Due to the formation and NPC order I was running, Imoen and Dynaheir couldn't easily flee to avoid Unholy Blight by Drakar. I could see that so I didn't even waste time trying. Extra healer for Imoen. First one used this run - I care more about her than any other NPC so it felt important that she could heal up quickly.
Meanwhile, Dynaheir had cast a perfectly placed Stinking Cloud. That cloud was MVP in this fight.

See?

And right after this, Drakar was Held by Branwen. An easy win overall.
Then I rearranged formations and tested so Imoen and Dynaheir would be closest to the exit when we went outside. I rested about 10 times, trying to coax the second ambush. Didn't happen. Maybe they can't happen in the same area within a game?
OK, Larswood is up next. Let's go there. And sure enough:

YES! That was a necromancy spell. I finally stopped an Unholy Blight! That was an ice arrow from Imoen. Kagain soon had both clerics poisoned using the kobold chieftain's 'Deth Stik' arrows. One of the thieves backstabbed Branwen but we were now dominating:

Dynaheir had been doing a little running back and forth. Not sure why the thief got visible just trying (in vain) to hit her. Maybe she was doing stealth rather than being under actual invisibility? Minsc has shot her with an Arrow of Biting, so she's severely slowed by the stuttering that damage causes. She brought out a bow with fire arrows and shot two of them at Dynaheir. But Dynaheir is wearing Nimbul's boots and managed to close to melee with her dagger without getting hit. And then, lightning struck a second time:

That was the spell she originally cast at the Cleric. What determines if it will strike again or not?