How the fuck

The main subject is a first-person view of a player in a video game, aiming a scoped rifle through a window at an enemy inside a house, then switching to a shield that reflects incoming fire, with the player moving along a rooftop. The player shoots an enemy through a window, causing a blood splatter, then deploys a transparent shield to block incoming gunfire while advancing across a rooftop, with the enemy visible through the shield's reflection.