As you watch, the man's face starts to push outward, nose and mouth getting wider and darker. "Run! Get away from here!" The man cringes and moans in pain, the grabs his head as horns begin to push out from the temples.
By now, it is obvious that he is becoming some sort of bovine creature. Black hide sweeps down his neck and body, and he starts to increase in size rapidly. His next moan sounds more like a bellow, and he archs back as the change flows though his waist and legs. His manhood swells out black and huge, then is swallowed up by a sheath nestled between deeper, furry thighs.
What was once a short human is now a massive creature that looks like a black bull reared back on its hind legs. No, it has arms and three-fingered hands, and seems to be standing up straight. A minotaur! The man is now one of the mythical monsters from Grrek mythology!