You're walking through a Crimson Forest. Unfortunately, your dumbass made a bit too much noise and accidentally woke up the Eyeless Hound that was sleeping on top of one of the trees. It jumps down and starts looking around for you. Every Piglin and Hoglin in your area immediately stops dead in their tracks and goes silent. That's how you know you fucked up.

Overlord / The Eyeless Hound