Found this out just recently in a ZF run. Nothing big, but it still helps if you're a low level group.
After the 1000 Trolls event, where you fight Sergeant Bly and his friends, tell the goblin to blow up the door, but don't talk to Bly.
Wait until they all start to hearth. This will take a few minutes. After they do, give it a second or two then talk to Bly and click the option. He will start screaming at you but will still be hearthing. The rest of his party will hearth, but he will be the only one to stay behind. He will turn hostile, then you can kill him and only him.
Lucky thing is, he's the only one you need for the quest item Divino-matic Rod. The others are useless.
Nothing special, just thought I'd mention it.