It depends on at what price the one sold his/her bitcoins. If he/she sold at 19000 dollars, they made a huge profit and they are still not in a loss.
yes, it depends on what price we sell. if sold in the range of 1900 dollars we can still profit, but not much. if we want to be patient and wait for the price to rise again then we will profit a lot.
Selling our bitcoin was not a bad decision especially when we knownthat we can still get profit from it. But if you are talking about panic selling because of the price drop them its really a big loss for you at some point. When price was dropping the best thing tondo was to hold for it because surely it will rise soon, by doing it you will loss anything, in fact you can get more profit from it.