Prompt: Write a short story about a man who discovers a magical portal

Karl was a man who always believed in the impossible. So when he stumbled upon a portal that led to a land of magical creatures, he was eagerly onboard. After following the portal for a bit, Karl found himself in the middle of a densely forested area. Suddenly, a creature called a harpy assaulted him, tearing into his flesh with its sharp talons. In a panic, Karl ran through the portal and back to reality. He would never forget the terror he felt when that harpy attacked him…or the feeling of relief when he returned to his home.