I took off my headphones – and noticed a stranger in peril

Slumped on the pavement, she wasn't breathing - and I wouldn't have realised if I'd been listening to music as usual. Time to stop blotting out the world ...

For years I walked the streets of London wearing noise-cancelling headphones, absorbed in playlists, politics podcasts or long voice notes from friends, and a million miles away from wherever I was. One damp January evening last year, I was walking home from my parents' house, headphones dead in my bag, when I noticed a small figure slumped on the pavement with her eyes closed. I might not have noticed her had I been in my own world, fixated on what was playing in my ears.

I asked for her name. Can you hear me?" I tried several times, my voice tightening. She didn't respond, and worse, she didn't seem to be breathing. My mind raced back to the one first aid class I took in school, but drawing a blank and worried that I might get it wrong, I dialled 999 and frantically tried to figure out if I could feel her pulse.