ORIGINAL: dubd
The wind was coming from right to left and it appeared you were pulling out of the loop with the plane coming towards you. Perhaps a stall occurred because there wasn't enough lift over the wings since you were flying perpendicular to the wind direction? Do you recall how much power you were giving at the top of the loop?
A very unfortunate loss, to be sure. But this isn't the cause.
Once an a/c has broken ground, steady state winds have no effect on airspeed whatsoever, and airspeed does not change simply because one is flying upwind, downwind, crosswind, or even when alternating between any combinations of the above.
I know that someone here will absolutely insist upon arguing and perpetuating the whole "downwind turn" myth. Please don't hijack this thread. I will start another for that.