Fanaelialae
Legend
Fair enough. It still sounds to me like different choices could have lead to a different outcome.While they could have barricaded themselves in somewhere, it wouldn't have helped the healers: the only party healer still alive was the one who was now on the enemy's side via psionic charm, the rest were all dead. Such potions etc. as they had had already been used just to survive this far.
Further, resting rates in my games are slow enough they'd have had to hold their fort for at least a full day (I forget specific numbers now, this was about 15 years ago) to even get one character healthy enough to be able to survive the glyph; and holding station for a day would not have been guaranteed in the slightest - again due to the turncoat Cleric who could simply cast Locate Object in order to find the PCs.
The party was in the 6th-10th level range with lots of characters, the main enemies were a group of Beholders backed by a few very competent adventuring types, and those Beholders were nasty!
Had someone not self-sacrificed to get the others out a TPK was all but certain; the only thing in doubt would be how long it would have taken.
They might have turned back sooner, knowing that they had the glyph at their backs. It's possible they could have captured a denizen or critter (a large rat, for example) and used that to set off the glyph on their return.
This is not to armchair quarterback the situation. Hindsight is 20/20 after all.
I'm simply attempting to illustrate that the player's sacrifice was not a foregone conclusion. Based on my understanding, they had many choices, some of which could have resulted in a different outcome where none of the players felt that sacrificing their character was necessary or even practical.
By comparison, in a real Kobayashi Maru scenario, the dungeon door would have slammed shut behind them and would have been unable to be opened without sacrificing a party member. It would have been impossible to leave the dungeon without sacrificing a character.
Whereas the sacrifice that occurred in your game emerged from the choices made. It's possible that their choices had narrowed to a point where it was between sacrificing one vs TPK, when the player chose to sacrifice their character, but it wasn't a foregone conclusion the moment they stepped inside the dungeon. That, IMO, is a big part of what makes your scenario fair, versus an actual Kobayashi Maru which is unfair.