Bosses who stay calm in a rush get followed. Bosses who yell in a rush get avoided.

Pressure is where people decide what they think of whoever is in charge. A calm voice during the worst twenty minutes tells everyone the situation is handleable, and they start bringing you problems early because it is safe to. Yelling gets compliance in the moment and costs you information forever, since nobody wants to be the one who reports the next mistake.

You will be in charge of something before long, even just closing or training someone. Notice who you go to when things are falling apart. Then practise the voice now, on a bad night at work or during a tense game, because you cannot invent it later.