If your a big buyer and the offer side will not provide you with enough liquidity to get your boots filled then you whack the bids and create a waterfall into your bids.
This is why when central banks intervene in the currency markets trying to prevent a strong currency from getting stronger or a weak currency from falling lower...their intervention rarely lasts longer than a few hours or a couple days......NEVER do they "change the trend".....all they do is allow the major players to get well long or short as the intevention provides huge liquidity.
Harvey Organ's comments below is bang on!!... http://harveyorgan.blogspot.ca/2013/01/gold-and-silver-whacked-againsilver-oi.html
The total silver comex OI baffles just about everyone. The bankers were hell bent on seeing major silver leaves fall from the silver tree. They instead got many new- born babies reading to sprout. The total silver OI for the complex rests this weekend at an astonishingly high 148,351. As the Thursday level came in at 144,195 we gained a massive 4,156 contracts on a fall in silver price of 71 cents. Somebody big was waiting in the wings ready to tackle JPMorgan and co- conspirator (Scotia). To me it looks like we have some major players of Eastern persuasion using proxies to accumulate many longs. They know full well that the CFTC officials are toothless as they refused to charge JPMorgan and friends as the major concentrated short. It is also quite possible that China is also the major short as well with JPMorgan as its proxy. It has been rumoured that the initial supply of silver needed to suppress silver's price came from China's hoard of 300 million oz acquired by Chinese communist leader Mao Tse Tung in 1949. China supplied the silver to the west in the early 1990's to aid in its suppression of our precious metals. With the left hand they supply and suppress and with the right hand they slowly buy back physical silver and store it on their shores. They also use the suppression to massively buy gold at cheap prices. If this is so, then the regulators have quite a problem to solve, as our precious metals leave our shores for the East.