its a bio 3. when you do flatspins your shoulders do not spin (hence the flat), because flatspins are basically sideways backflips.<br />
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think about this trick if you tucked your legs up. you drop your right shoulder forward and spin around it=bio<br />
(a cork 3 is where you drop your left shoulder bakcwards and spin around it)<br />
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ive done the same thing (how i figured it out), i threw that and then sat there for a minute or two being liek what the fuck just happened, i needed to take vid of it to be sure
