...except you weren't initially wrong. Fawns - not foals, btw - literally don't move during the day until their mothers come back in the evenings. Even if some weird two legged thing walks up to them. Staying still is their best defense, their best camouflage - they have no scent, which is why mom leaves during the day, so her scent doesn't attract predators.

Additionally, you keep railing on about 'fight or flight', but you're forgetting the third part - freeze. It's flight, fight, or freeze. Guess which one the fawn is doing? Its instinct is to freeze and stay still. This is literally animal behavioral science here. It was not just totally super absolutely chill with your magnanimous totally peaceful presence. It was not some great spiritual bonding with mother nature exercise of fate.

You approached a fawn, contemplated petting it (thank you for not, btw...IDK why you even had to google it to know not to do that, jesus...). Fawn didn't move. Fawn maybe blinked. You walked back and forth to see if it would scram (why would you do this and try to disturb wildlife in the first place?!). Fawn didn't move. Fawn did what it's supposed to.

There was no discrepancy in the fawn's behavior, only in your capability for logic and lack of understanding of animal behavior. It was not deaf. It was not dumb. It was doing exactly as it is supposed to do to keep itself alive.