The image below shows an automated trading algorithm called Stop-loss terminator, trying to trip loss triggers and cause a surge or loss collapse. Evolution has gone electronic.
… the end game is obvious: hunt for loss triggers on both the up and the downside, and hope to precipitate a stop loss collapse or surge. How the underlying engine generating the trading pattern is positioned in parallel to the underlying, certainly via options, is unclear, although it is obvious that the ulterior motive is to generate some very dramatic short-term liquidity. Not surprisingly, after it completed two quick cycles, the algo disappeared and was not seen from again.