The person sitting next to me in the bus today was talking on the phone. One line that intrigued me was: "I'm not sure that the plan will work, we'll need a buffer."
I doubt that the word buffer fits there.
Buffer: a person or thing that reduces a shock or that forms a barrier between incompatible or antagonistic people or things.
something or someone that helps protect from harm.
I can understand what he meant when he (perhaps accidentally) used the word, but it doesn't seem to fit at all!