when the price of bitcoin drop i dont usually panic on selling it out or cashing it out because after a weeks it will pump very high tried and tested since i begin on bitcoin and also bitcoin is so dramatically when it comes on crashing and then suspense when it comes on pumping maybe bitcoin is being control and depends on the traders .
Well you are a strong trader but sometimes you must dump your coins and try to get the bitcoins even cheaper, this is what most traders does when then see a dump coming, they join it and expect cheaper coins, this year it happened twice with 200-300 dollars between before and after the dump, and well bitcoin has recover in part those value, soo it would mean around 10-20% extra more bitcoins if you had followed those.
I agree that if a trading thinks the price will drop soon, he will sell regardless of the current price. The problem is guessing when a dump will occur. Usually it happens after some bad news or after the price has gone up really high. It's very hard to time it correctly.