Flash events and what they taught about stop placement

[Amanhasnoname]

Sudden collapses in liquidity, like the pound's flash crash in 2016, show how fast prices can move when depth disappears. Moves of hundreds of pips in minutes, quotes jumping with no trades between, and stops filling at absurd prices have all happened.

For scalpers, the lesson is not to predict the next one, but to build a setup that survives it. Negative balance protection, small position sizes relative to equity, and server-side stops limit the damage.

Leverage plays a major role. High leverage with several positions open can wipe an account on a move that would be survivable at lower exposure.

It also shows why liquidity is not constant. The depth visible during the day can disappear within seconds when the market is stressed, and orders that looked safe fail.

Most scalpers never face such an event, which makes complacency easy. Preparing for something that happens once in a few years, at a cost of reduced size, is a decision each trader needs to make deliberately.

Has an extreme move ever hit an open position, and what changed afterward?