whether someone will panic again and sell their bitcoin that they just bought a few days ago when going price up and now the bitcoin seems to have started lowering the price again, I hope it won't do it, because the market can suddenly rise and fall very quickly , so we must be calm and not be too hasty in buying or selling when the market moves up and lowers prices.
If he thinks that is a good way of making a profit, then he can do that way so he can wait for another buy price which will be lower than before. That is the function of analyzing the coins so he can find the right time to buy and sell, and even he can decide to sell the coin in what price. But yes, I agree that he needs to stay calm if the price is increases or decreases because sometimes that is only a shock therapy for traders to be panic.