The nature of the UNICORN.

The horn of the unicorn served a specific purpose.
You see, the Unicorn was greater than any Horse. Larger, stronger, faster, more agile and and as intelligent as a human.

They had giant teeth shaped and arranged like a humans. They were beautiful and calm when being viewed on by humans. Their essence drew you in and their lack of fear was inviting. So people would slowly approach them talking softly and in a reassuring manner.

The Unicorn would respond in a friendly manner approaching the human easily and relaxed, showing no menace or feral behavior.

Then, when the human was close enough to touch this beautiful calm and confident creature, the Unicorn would show its human teeth in a smile.........freezing the human with this unexpected display of human emotion and white even teeth.

The Unicorn would then bow in what appeared to be a gesture of welcome and submission.

When the human would move forward to touch the calmly stooping Unicorn it would charge forward and upward like a rhino. So fast if you blinked you would miss the movement.
Impaling the human before rising up on it's back legs and slinging it's powerful head and neck forward. Slamming the human to the ground as easy as if they weighed no more than a hat.

Then it would once again resume it's calm peaceful nature as it stands over you and again gives you that human/inhuman smile.