@bitprophet @paul Good to know what they are should we ever get one.
The US stock markets have automatic trading "Circuit Breakers" where trading will pause for limited time periods if the market total valuation drops. 7,13, and 20% drops will trigger L1, L2, and L3 respectively.
L1&L2 trigger a 15 minute pause. L3 pauses for the remainder of the day.
Paul is wondering/anticipating the markets reacting so negatively that we will loose 20% valuation in a single day, triggering the L3.