Market Makers, page-7

A couple of questions.
How do you know someone sold 200k shares?
And if you are right and somebody sold 200k shares, then as I understand it if someone sold 200k shares at market price (around 73c at the time) the market makers had to buy the shares from them and then move them on to other people. So they looked at the Buyers with Limit orders and saw that there were about 5 people willing to buy around 200k shares between them at 70c and therefore the price dropped to that level and the shares were automatically sold at this price? and that would account for the fall in price?