Recently I was cycling a local narrow lane. Land sloped steeply from left to right, forested. Up ahead, on an incline, I saw a solitary female jogger, a rarity hereabouts, running on the right hand side of the lane, with a very steep unfenced slope down on her right. At some 25 yards I eased off and rang my bell (a loud Pashley 'ding dong' bell), I saw her head partially turn to the left. Good, I thought, she heard. When I came into her peripheral vision she spooked and nearly went down the slope. She had in ear headphones in!
If one cuts oneself off from the enviroment that is being inhabited, then 'nasty' surprises will ensue.
This is true for all of us. I try to ride defensively (eye contact etc) for my own safety, always looking around and listening.
The victim, in the original story, was said to be looking at her 'phone, distracted. The cyclist, seeing this, should have behaved accordingly for his own safety as well as hers.
We humans have two remote sensing abilities for a reason. To deliberately disable either, by choice, is to put oneself and others in danger.