stall=flows no more and begins 'flowing less' at or beyond a given lift
air speed/fps-feet per second-becomes too great = turbulent which disrupts flow, literally causes the air/fuel to no longer hang on/flow with the throat/bowl shape or short turn and takes all air with it, crashing around like cross winds/-eddys.
saturation=will flow no more but hangs on around a certain cfm, or flows the same no matter how much more valve opening there is.
You are better off with saturation than stall cause at least the #'s aren't falling off like with 'port stall'