As soon as I put my trade through to short SPY, I realized that hedging myself was an emotional decision. I became scared that the market would go down and I let that fear control me rather than logic. I walked away from the computer for a few minutes and thought about my decision. Then I checked the put/call ratio and saw that there was put buying. That cemented my decision to reverse myself. I ate my ten cent loss and covered my short.
I make a living largely on the bad emotional decisions of others, so it might seem odd that I can make the same mistakes. I am just human and that realization allows me to correct myself quickly. I'm just a primate typing on a keyboard that can act emotionally.