Why does demogorgon make survivor noises randomly?

After all this time since release, demogorgon missing an attack, or breaking a pallet, has a lingering sound effect that sounds like maybe bill or david moaning in pain from being injured.

Why is that a thing?

EDIT:

Jumped into a custom game, it doesn't always happen, but it happens sometimes, when i "nod" yes in the video, is right after you hear the sound effect, i also nod "no" in the times you don't hear it. But it is super clear in some of the attacks.

https://youtu.be/YAQ9qbZFgg4

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