I thought that the market was staging a high volume breakout below 812 so I got short at 811.50. Thirty minutes later the e-minis were trading above my entry price. Volume remained moderately high during this 30 minutes of sideways action.
This is not the right rhythm for a breakout move. I always expect fast results on this kind of trade. When I don't get them, especially if the day had seen relatively low trading activity, I suspect a shakeout instead of a breakout and get out of the trade.