Once Barney sends you into the alley, you'll be on your own. You have no weapons yet. Your primary objective is to avoid detection and escape the immediate area. Move through the narrow passages and courtyards. You'll encounter more CP officers. Use cover and stealth to avoid their sightlines. If spotted, run! They will pursue you, but they are relatively slow. Look for open doors or climbable objects to escape. Eventually, you'll reach a playground area. Continue through, and you'll find a way into a building where you'll meet Alyx Vance.
Half-Life 2
Evading Civil Protection
Learn how to evade Civil Protection in Half-Life 2. Focus on stealth, cover, and using the environment to escape patrols during your initial foray into City 17.