in rifle marksmanship, we talk about the “natural respiratory pause” the moment of balanced hesitation between the exhale and inhale during normal breathing;
this is when we teach the shooter to squeeze the trigger, when the body is at maximum stability
there are 2 moments: after the inhale is complete, but before the exhale begins; and after the exhale is complete but before the inhale is complete
now, think about the metaphorical relationship between rate/type of breathing and the amount of relative volatility
a bottom tail, then, corresponds to “last gasp”