None of that has any meaning. When you look at L2, all you see is the tranches - the partial trades. All 911 means is that the rest of the order went at a different price, and this was the rest of the order.
You guys really need to get with it - none of those old wives tales mean shit, and if you think they do, you are at a trading disadvantage, because you are believing in fairy tales and making buy/sell decisions that are meaningless.
No one knows what a whole order is, and how it is filled. What you see is only the partial trades on the way to filling an order. Ever order 453 shares of a stock? I thought not. People order on even numbers, and MM's fulfill the best they can at the best price for them. What your's 911's are is finishing up the order with more expensive shares.