Such scenarios make the new traders panic badly, eventually making them leave their coins. Here selling will definitely be at price lower than that of buying. I don’t think so people deliberately sell at low to meet their needs.
That's true and I did too. But I learned from my past experiences. Weak hands tends to sell at lower price if the coins is dumping. You got nervous if you are losing. But if you have a good coin, like in the top coins in coinmarketcap there's no problem, it will rebounds later.
You got the correct lessons from your experience and the guy that opened the thread said the right thing. I investigate my past sell orders, all are in profit right now. At the time I sold them, I had thought I made profits. I was wrong.