Wait for the RED Scout to approach you, then strike.
From Create Your Own Story
You stay in position and wait for the Scout to approach you. As he jumps over your head you thrust your knife up and into his thigh. He drops to the floor and begins to let out his death-throes but you silence him by slitting his throat. The HWG sees this occur and begins to cautiously walk towards your cover while shouting out taunts in Russian. You pull out your revolver and jump from cover to take aim.
You only have one shot at this, where do you aim?