first off Kuddos to the Strap for exiting yesterday, the QQQ bear long exiting this morning, and for the bear long we manually exited 1/2 yesterday because it had achieved the reversion to mean. This is a good example of that momo indicator - back in July that indicator helped hold the trades for 5 weeks. However this time it was a negative as it prevented it from closing yesterday.  

Because that can happen is why my practice is to always sell 1/2 once the reversion to mean is achieved even if the system decides to hold because you never know.

That said where I F'd up is that usually in the past I would not only sell 1/2 but then set a stop at entry - which would have had had the remaining stopped out at the entry. Now price is below entry and of course it's exiting at the close