That way there is less chance the market will out run you. Surely the experts have a plan to protect positions at critical times. The third rule just places another double check in a good trading plan. Traders must never be complacent when the market is at extreme volume whether high or low volume. These times are to be flagged and I don't know a better way to flag them than to remove existing positions.
Few traders watch the floor indicator.
They wait to get off. I've seen what waiting can do to people. It was back when the Hunt Brothers had too many bean positions in place. They were told that they would have to get out. I had just put a position on and within seconds the market was practically all sellers.