Quantum Theory

Fight Fire with Fire
Shoot down 10 projectiles from the Raven.

The Raven is the boss fight in scene 11.
The Projectiles are the big orange fireballs he is shooting at you.
Just stand in the middle of the circle and follow his journey arround the circle. While he is circling arround your position he fires the fireballs at you. Just aim for them, quick, and shoot at the balls and let them explode. Usally he shoots 2-4 times at you and then he makes an other attack. So be prepared to dodge the other attacks. and then he will shoot again at you.

You will encounter the Raven at the end of scene 11, after moving along edges and killing birds. The fireballs will come fast at you, and I found that aiming at them were often hard with a machine gun. Use the shotgun, and you will always hit them.

As an example, I hit perhaps 1/10 with a machine gun, while with the shotgun I hit 9/10.