No worries Pauldog7....it is a very complicated system, it can also be used to stack bogus large buy/sell sides to either frighten traders to sell or encourage traders to buy, the trade is pulled from the system never intending to be bought/sold - there is a term for this, but it escapes me atm.
If something looks a bit unusual, it pays to check trades as bots may be behind it.
Having said that, their aim isn't always to manipulate a sp.
BLY Price at posting:
$4.62 Sentiment: Buy Disclosure: Held