While not as dramatic as your story, last month were on our way to Paducah Kentucky for the quilt show. We had been on the road way longer than I intended and it was dark and our headlights in a word SUCK. I felt something was wrong when I couldn't see the centerline. Then a set of lights came on and a little chirp from a siren. Pulled over and a 12 year old looking city LEO came to my window. Of course I had my license out and my worry cap on. He said no need for your license sir, I just wanted you to know your left headlight is out.
I thanked him and asked where the nearest NAPA, AutoZone or parts store and he suggested Wally world a couple of blocks away. Safer there and better lighting.
He asked if I wanted him to run interference for me and I said sure. Led me to the lot with no safety lights on and deposited me there, made sure I had tools and took off.
He could have been making sure I changed the headlight but I think he was being helpful and considerate.