This is a typical thing in any market. A panic sell is quite normal, and a recovery usually always follows. You'll always see action from panic trading, that's where the money is to be made for the level minded players.
It's surely is a normal move upon seeing those people that are satisfied with the current price. But when someone starts to do so, the price will going to keep on being down and that's the start of others to do the same thing because they doesn't want to be late in able to cover some profit.
I do not think that trading bitcoin is the same as trading forex. I think no margin call or pip in bitcoin trading. Panic selling is fine as long as we can get profit. We do not have to worry if bitcoin price down because we are see that bitcoin price will always rise, aren't we. So do not do panic selling if we afraid to lose money.