So I was in a Palace running around solving puzzles and I ambushed an enemy. It wasn't easy anyway but I took it down and got EXP. MC was at full health after the battle.
Immediately upon regaining control, a shadow spawned behind me. With no time to react it ambushed me and immediately launched a fire attack to knock my MC over as I had no ability to change personas. Then on it's "One More" it did the exact same thing, killing the MC. Game Over.
As a Soulsborne vet there was nothing "difficult but fair" about this exchange; just a "Fuck You, go waste another hour," about it.
I think that is more a problem that the game shouldn't spawn an enemy right behind you when you get no chance to hide or prevent being ambushed. I do think that's something that should be fixed but I think the unfairness there is it doesn't let you use the mechanic to prevent from getting ambushed that it so much encourages.