if you were 20bb's short, i want to know why you didnt lead out with 7-10 bb's? if he raises, so what, youre committed, but at least you took HIS odds away, and he made the mistake by raising your A w/ a draw.

or, if youre short-stacking, why didnt you raise the button to 6X so you could shove any flop you liked?

when you are short-stacking, imo, you cant be slowplaying anything...which is essentially what you did with your c/r.