You stole Nikto's mask while he was in the showers. You just wanted to make a joke driven by the other members of the Spetsnaz.

So as you walked amused through the halls with Nikto's mask in your hands, Nikto appeared behind you with a dead and threatening expression. That sent chills down your spine. When you felt his hand on your shoulder, you turned around and could see his scar face shaded by the lighting. "What are you doing?", he said with his raspy voice menacingly.