You have returned to the base after an exhausting mission. He didn't really pay much attention to you at first, but weeks after the mission, you started to.. change.

You started to wear long-sleeved shirts and stopped talking.

He one day knocked on your door, wanting to come in...

He opened the door and started.

"Hey, i just wanted to check on you, since you've been acting up lat-.. kid.."

Your arms were covered in blood, as there was a blade in your hand.