It's typically recommended that when finishing with the use of an O/A torch, you shut off the acetylene first, then sut off the oxygen. I realize that this extinguishes the flame immediately, because the fuel gas is gone. But in my experience it also often causes a pop (a big pop with larger tips). But if you shut off the oxygen first, your'e simply left with the loose acetylene flame of the type you have when you spark-light the torch at the beginning of the session. Then you can quickly shut this off. No pop. As long as you're careful where you're holding/pointing the tip, it does not seem unsafe.
If the session has gone nicely and you're in control of the torch and flame, why is shutting off in this order (oxygen first, then acetylene) a problem? - or why is this recommended against? Has anyone here actually experienced a problem (your own problem, or somebody else's in a shop you were working in)?