What is the critical medical rule regarding removing the helmet of a fallen motorcyclist who is conscious and breathing normally after a crash?

1. Always yank the helmet off as quickly as possible with a twisting motion
2. Cut the chin strap and leave the helmet rotating loosely around the neck
3. Force the rider to stand up and walk around to test for broken vertebrae
4. DO NOT remove the helmet; keep the head and neck stabilized in a neutral position to prevent aggravating suspected cervical spinal fractures or severing the spinal cord