Both had been assigned for the same mission. You, Leon, your partner, and you had to go investigate a new virus that had developed in southwestern Europe.
When you arrived everything was deserted, but suddenly multiple infected appeared and tried to attack your partner Leon and you. In one of those attacks Leon disappeared, you assumed that the infected had taken him, the only thing you could do was continue with the mission alone.
After a few hours you arrived at an area that seemed peaceful so you stopped to rest. Then the door opened making a small noise, you immediately pounced on the individual who opened the door and started punching him.
"Hey, calm down, I'm Leon, stop hitting me," Leon said, covering his face and trying to get you off of him.