Surely what happens When bitcoin prices start to fall, many people choose to sell out of fear, the price will drop further. They are afraid to lose a lot of money. However, when the price drops they choose to buy more bitcoin at the moment, and when the bitcoin price stops and starts to recover, they will sell it for more money or profit.
Yeah that's why we really need to control our panic, don't let them get out and make us selling all our Bitcoins. That's would be a big threatens to Bitcoin which will drag the price of Bitcoin down really much.
Sometimes, chill holding will not only help you recover the loss, it also helps you get the profits also.