Places hands in the air like a Frenchman. Does it matteur?
The point is they're s*it, the chain falls off. The whole basis of it is about knocking the chain off and hoping it catches the next cog and not somewhere inbetween. Then hoping you have all the the little grubscrews just right so it doesn't fall off the end. A typically French so what it sort of works design.
When I was a teenager I had my chain come off going up a mountain path (in Scotland). A French couple were out walking. The woman saw me and shouted to her husband who was some distance ahead/behind (I don't remember which way they were going). She shouted "Phillipe!!! Une probleme mechanique!" Phillipe was actually quite good at sorting it, using nothing but a stick.