Forensic puncture analysis
Volunteering for a fondo ride, I helped w/ a puncture, & offered to take the tube so
the rider wouldn't have to deal with it.
I tried to locate the hole, out of curiosity, but the air escaped too fast.
Later, at home, found & patched the snake bite pair of holes, but on testing, found another, small puncture.
My theory is that the small puncture came first, & the pinch flat happened after the tire had lost some pressure.
I wonder if this is not the case for some of those mystery 2nd flats- the obvious pinch flat is blamed, missing
an embedded thorn that started the process.