trying to stop a spin or flip mid trick usually means you flailing around in the air and then going into the afterbang position right before you land and probably splatting all over the ground. plus then flips always end up like half flips and you land on your head, spins always seem to stop at 90 degrees and ou not facing the way you need to be and then you twist 90 so you land straight.
i.e. don't do it. or avoid it I guess. i do it sometimes and then I know I'm fucked.