The rogue went down at the end of a running chain of 4 encounters the party charged through, right as they decided they had bitten off more than they could chew and turned tail to run. Just walked off and left him with the remaining mini boss. If it weren't for the mini boss's tactics of getting other people to do things that require him to leave his throne, the PC would have been killed on the spot. As it was he regained consciousness about 10 minutes later, and slowly and carefully crept away with the aid of some great stealth rolls while the morlock tried to work out how to get a second casting of telekinetic manoeuvre.
And then the next morning he decided to be the bait in a plan to lure a drake out of its lair, got stuck trying to scrabble up an embankment out of the way, and was obliterated in a flurry of teeth and tail lashes. It was brutal, even with PF2e's generous dying rules he turned from alive to dead in only 4 seconds as the first strike knocked him unconscious and the next two burnt through his dying condition.

Luckily the player already had a backup ready so when the party turned tail and ran again I was able to maintain a natural flow of roleplay to reach a point where I could introduce the replacement, but it was sudden and shocking for all of us. For the players it was shocking because in a single turn the drake turned him from slightly damaged to chunky salsa, and for me because its not actually a difficult fight - I mean, a drake is still a dragon, so it is more dangerous than raw stats make it look, but if they'd put the tank front and centre instead he'd have easily withstood the initial barrage and they would have steamrolled it.

They're going to be so mad when they realise it's only as tough as the minotaur skeleton they took down instead in order to get some xp and level up before taking it on again.