What is the proper procedure for extricating a casualty with a suspected spinal injury from a crushed truck cabin?

1. Pull the victim rapidly by their legs and twist their spine
2. Maintain axial spinal alignment (head, neck, and torso kept in a straight line without twisting or bending) until specialized medical immobilizers arrive
3. Fold the patient in half to fit through small window openings
4. Have the victim stand up and jump to the ground