Very true, there are certain persons that when under pressure, you would not even notice because of how well they are able to manage and control their emotions. While others like you rightly said let their emotions run wild under pressure.The thing is that it is not everybody that can walk under pressure as most people snap when they are being pressurized at their workplace. So it is more ideal for everyone to avoid being put under pressure so that they can be able to do their work in a good way.