Seatan remembered the day as if it had just happened. 

It started off just as it had with the current stranger, except he never fulfilled his promise to return. Seatan went out to find him. He found him around a mile away from his house. He could remember their conversation vividly.
"Where have you been" Seatan asked the stranger, this one called Aleks
"What?" he replied sarcastically, "you actually thought I would come?"
"Of course I did, you killed one of my deer!"
"Heh, well, you win some you lose some, don't ya'?" Aleks laughed, as he began to walk away. And then it happened. Seatan changed. He changed into that side of his that he can never allow to be released again. Not for the good of others. Not for the good of himself.
"Oi!" he shouted, "Get back here""
Aleks turned around, and the blood drained from his face. He stood there, frozen, unable to move due to his sudden fear of the new Seatan.
Then he did it. Seatan grabbed Aleks by his arm, and flung him at a tree. The audible crash created caused all the birds in the surrounding area to fly away. Seatan saw what he had done. He had killed Aleks. His leg. His leg was in one place. And his chest was in another. And so was his arm. The tree was covered in blood. It had happened so fast. Aleks had had no time to scream. Seatan was back to normal now, backing away, unable to comprehend what he had just done. He ran back home, and collapsed onto his bed.

Seatan woke up with a scream. Not loud enough to cause damage to anything near him. But loud enough to wake a couple of his deer. He was covered in sweat. He walked into his bathroom, and splashed some water onto his face. He looked into a mirror and didn't see himself. He saw a monster. The monster that had killed Aleks and... it was best not to think about this. He went back to his room, unable to look at the picture of his father, and unsuccessfully tried to go back to sleep.