The Sentry Gun Vs The Turret Vs The Combine Sentry Gun

Pre-Death Battle
Now, pretty much this is a Valve Sentry Gun fight from their three games that actually have never seen the number 3: Team Fortress, Portal and Half-Life. Note: I'm using their SECOND game incarnation and the Team Fortress Sentry Gun will upgrade throughout the fight, but The Engineer will not be included to make the fight...somewhat even. And now, with no more info to cover, I bring you... THE ROBO-FIGHT!