> Then his helmeted head hit the ground so hard it knocked him unconscious — hard enough for his Apple Watch to feel it.

> “A hit that hard could have killed me if I weren’t wearing it,” Burdett said. He had to replace the helmet.

Letter to the editor: the last sentence is a non-sequitur. You have to replace a bike helmet any time it takes an impact, even if it isn't "so hard," because even if it doesn't look damaged the foam may be compressed and useless for a future crash.