If you see the price is down fast and seems to crash, you do not need to panic because we will see that happen many times in the crypto market.
I'm sure that those people who are all into bitcoin markets for years definitely will not get panic when they are watching market crash but at the same time it must be a basic human nature to get panic when their hard earned money is melting down; I mean bitcoin market will have all types of people (some stay calm always and some may not) still bitcoin got all the power to prove its potential in the end to all of us.
They will not panic IF they have control over themselves and knowing that volatility is the biggest part of crypto that will always happen day by day. If they can not prevent the panic, then maybe crypto does not match to them and better to leave crypto and do something else.
Yes, we are humans who can panic related to the current situation, but we can take care and handle the panic so that it will not become bigger. But if we see the market in a bullish trend, we become greedy and want to sell at the next higher price. Once again, if we can not control ourselves, we will not sell our coins to profit.