KNL Chart, page-269

The end volume used to cap is nothing. Cappers buy and sell sometime their own shares to get the SP to the desired level. An algo can drop a SP 20% while losing little in terms of shares held or capital value. They do this by selling down two steps then buying up one or two steps to sell for a small profit minimising losses shares held remains only a little more or less. This technique is used in shorting.

All my own speculation as Im sure no one would bend the rules to make money that never happens in the real world cause eveyone is honest and fair. LOL. Also it is probably legal if the right lawyers are used, not supposed to buy and sell your own shares but Can't help it if the algo computer gets it wrong its the programmers fault not the hedge funds. blah blah!. Most hedge funds answer to the Cayman Islands laws anyway.