This behind-the-scenes is decided into four sequences. "The Burning Man (Fire Effects and Face Replacement)", "Building Jerusalem (Digital Matte Paintings and 3D Modeling)", "Casualties of War (Artificial Intelligence and Virtual Warriors)" and "Medieval Engines (The Physics and Firepower of Trebuchets)". These cover the subjects mentioned in their subheadings as we learn more about various visual effects techniques. These show the different elements used for the sequences along with commentary from visual effects supervisor Sewell. He talks about what each scene needed and why they made the decisions they did. These come out as interesting segments that provide nice insight.