JOHN_DEV has joined the game.
Leave the blue flag area, take the *first* right, and look up, but don't get too close to the walls. Its pretty anal about where you are when you shoot the eye, I shot at it from where I first noticed it, but if you're not close enough, the bullet goes right through the thing and doesn't trigger a hit. You have to be just about as close as you can get while still able to see it.