basically, how it works is this. When the voltage gets to that point, it will stop. Obviously, when you don't keep on the gas, let it go, wait a minute, it will go again, but only a short period until the voltage drop hits again. Like I said....like when nitro runs out of gas.
"if you've got something to say, say it peacefully"
Some controllers allow you to set up a slow cutoff. Which will slow down your vehicle before the cutoff is reached. Hard cutoff will basically shut the controller down.