If you want to stop quickly you don't get out the saddle, that just makes the skid longer, you just wrench the pedals backwards.
It's quite a challenge to skid at 20mph without getting up honestly
I've found this to be the case. If I need to slow down quickly, it's an application of back pressure so quickly it does occasionally become a skid.
@Sumo started
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If you want to stop quickly you don't get out the saddle, that just makes the skid longer, you just wrench the pedals backwards.