When the townspeople came, how did they find the man who had been possessed by Legion?

Answer: Clothed and in his right mind

They found him sitting there, clothed and in his right mind, and they were afraid.

“Those tending the pigs ran off and reported this in the town and countryside, and the people went out to see what had happened. When they came to Jesus, they saw the man who had been possessed by the legion of demons sitting there, clothed and in his right mind; and they were afraid.”— Mark 5:14-15 (BSB)