Metro: Last Light - Ranger Survival Guide Chapter 2: Enemy Danger

While deadly creatures control the desolate Moscow wastelands, the human survivors, having splintered into extremist factions, gangs of bandits, and the order of Rangers, try to maintain a hold on the tunnels of the Metro. To stand up to them, the player has the choice: will he try to sneak past the threats, save their lives and rare ammunition, or will he seek direct face-off to wipe them out once for all. Both ways carry risks and every action has consequences within the tunnels of the Metro.
The second video in a series of three, "Enemy Danger" prepares the player against the hostile inhabitants of the Metro, both human and mutant.