trader58,
Good stuff and I just want to add a little:
Fletch, if you look at 2 days 1min chart, you would see this:
7/27, DE moved up, so the specialist maybe on the short side (fair enough?), when DE was upgraded by whoever with no fundamental change (earnings/warnings/CEO died) on 7/30, he'd do the followings:
1. Gap up the stock in the way there is no buyers (at resistance level - known as OVERSHOT)
2. Show HUGE size on the offer to squeeze out the sellers (those overnighters who were LONG on 7/27 want to take quick profit)
3. Heavilly short DE himself to average down (in this case, he adds more position on the short side to REDUCE his lost)
So, trader58 was 100% right it's a SHORT on the open, (you were right too by shorting it
then DE went down, to a certain point (42.30?), those who short with the specialist(include you I guess) covered their position (you did), that is what that bump is about, but the specialist KNEW (he has the book)this, and he WAS NOT GET EVEN YET, so, he shorts more and make it weaker, until it finally closed (or close to ) the gap, he is IN THE MONEY, doesn't need to do anything but COVER all his SHORTS, because he knew that eventually, DE would go up (upgraded huh?), so, next time you go long (bottom fishing), wait till the gap closed (or close to be closed or at flat line for a while).
Here is more: when a stock got upgraded, the chances are, the investment brokerage/bank who did the upgrading has TONs TO SELL!, the specialist knows this and play along with that gap-up open.
I am using similar system trade NAZ with great success.
One comment on the tape reading:
People pay attention to the print on size and price, I say, more importantly, pay attention to WHO BOUGHT/SOLD at that price, (I sometimes even write it down roughly) make sure you know if the specialist are NET long or NET short, then trade with him.
Good luck