0.00-0.10: A scaled down rocket with mini custom cloud textures and matte painting square. The rocket is the only thing that doesn't move while the rest moves up and rotates towards it as the camera shakes, creating the illusion.
0.11-0.18: Another scaled down rocket. This time in a custom version of 2fort with the bridge removed. Then using custom individual plank pieces i rebuilt it. The mini rocket creates the illusion of being super high as the full scale rocket would clip through the skybox. When it gets to the point of impact I switch out the mini rocket for the full size one and line them up via the camera perspective. I then animated each of the pieces of the bridge myself with some payload pre baked explosion rubble in front to represent the ground.
0:19 onwards: Examples of the ipi motion capture data via 2 kinects. I didn't bother moving my head or hands much as it only tracks the lower half of the spine and the forearms. Upper chest/neck is not recorded and needs to be done by hand. The map at the end was made in Hammer. A quick rip and paste job of 2fort with a load of assets added to the pile within SFM.