Those panic sellers just looking for profits, the price reached $700 and I thought they have been planned to sell their coins at that price.
However, the price increasing so good today and we will reach $800 soon, and they will going sell coins again, lol.
i think the definition of panic sellers are those traders who getting easily baited by troller and when the price of some coin which they were invested falling even just a little,they're blindly selling to avoid losing even though it make the condition of the market even worse,if they're selling when the price just reached the highest or because the price were high enough,it's definitely not a panic sellers but a sellers who take advantages of the situation
They do because they lack knowledge and they just follow what the people are saying, when you are a matured trader you wish to see a panic selling so the weak hands will dump and you have now the opportunity to buy cheap bitcoins.