How did you handle the Q4 market decline?

I went to 100% cash just before the close on Oct. 2 by selling the two names I held, Square (SQ) and Amazon.com (AMZN). I tweeted this on Oct. 4.

I do not own a crystal ball. My entry and exit decisions are based on the price/volume behavior of the averages, the action of leading stocks, and, secondarily, divergences.