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.......Allow me to explain. When diving with multiple tanks one of the dangers is inadvertently placing the wrong second stage in your mouth and breathing from it. In the case of technical diving this potential problem is addressed in several ways. In the case of recreation divers what can happen is the diver places the pony in their mouth thinking it is the primary and has an OOA. They stress and think "Better switch to my pony" and find it is empty. This has happened in real life situations......
What's up Doc?
If you sling the pony it is pretty hard not to realize I am breathing off this yellow hose connect to this bottle right in front of me rather than the hose over my right shoulder.
Lets go with the logic The diver placed the pony regulator in his mouth inadvertently and is breathing until he runs out of air (Lets also assume the diver never checked his back gas spg from the time he entered the water until he ran out of air) Wouldnt he then switch regulators in a OOA situation to his primary back gas (Thinking it was his pony reg)? He would get plenty of air, thumb the dive and realize he needs to rethink his setup. How can you be on your pony, run out of air and switch to the same regulator in your mouth? The act of switching regs will give you your back gas back!
To mitigate the above problem. Sling the pony, predict your pressure then check it as trained (Gives you an idea if you know how much air you are using). I check my back gas spg often and my slung pony spg often.