When it is falling, a lot of people will ask you to buy or to hold, but you should look for the reasons why the price is falling, if its caused by usual correction then holding or buying is already correct, but if you found something suspicious, like the coin developer want to scammed people or there are weakness in the coin, then you should sell, investing in alt coin need patience and need a strong mind
so true . do not be affected by falling market prices. but check what happens. and if it is true that the market price is down it is good to buy or hold your coin. and when the market price rises you can sell it. So the point is to examine and be patient.