Here's a possible outline for the short screenplay based on your prompt:

1. Opening scene: We are introduced to our main character, a man riding his bike down a country road. Something happens that causes him to crash and fall unconscious, ending up far from his original location. Perhaps his tire blows out or he swerves to avoid hitting something in the road.

2. The man wakes up in a harsh, unrecognizable desert environment. He is disoriented and unsure of how he got there. He begins trying to find his way back, but struggles with the intense heat and terrain. This could be an opportunity to show his perseverance and problem-solving skills.

3. As he navigates the desert, he encounters a series of challenges and obstacles. He has to find shelter, food, and water, all while trying to figure out which way will lead him home. He meets some helpers along the way who teach him lessons about survival, humanity, and himself. These challenges help him grow as a character.

4. After a climactic push through the desert, he finally makes it back home. He is changed by his experience, having learned from the difficulties he faced. The ending shows how he has grown from this transformative journey.

This is just a basic outline, but it hits the key parts of your prompt: the man gets knocked out and wakes up in the desert, then goes on a journey home where he learns lessons. From here, you could flesh out the details and dialogue to develop the full screenplay. Let me know if you would like any other suggestions or feedback!
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