If normally hostile mobs exhibit "unnatural" behavior, it would foreshadow the greater threat lurking in the dark. They're scared because the predator has become the prey. Players expect these mobs to behave as they always have in every biome and dimension: if they see you, they will attack you. These mobs will never follow you into the Deep Dark and if they can find a path out, they will flee. Seeing them prioritize escaping instead of pursuing you should make players think "what are they trying to save themselves from?"
Since spiders can climb and Endermen can teleport, they will always keep moving/climbing/teleporting until they find a way out, even though that will make a lot of noise. They might die to the Warden in their desperate attempt to get out, so their deaths should serve as a warning of what could happen to you if you don't be quiet.
Other mobs will try to keep quiet if they can't find a path out. Zombies will run to a wall or stand in the corner and cover their face. They are petrified, they stay facing the wall and ignore the player. Skeletons stand in place and shiver in fear, they don't dare to move except when they turn to look at you in desperation. They will still shoot you if you attack them. Witches will drink an invisibility potion, a helpless attempt to hide. If you attack them they will throw a potion and run far away from you.
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