One stays calm so that others don't lose their temper.
TranslateBing DeepL Google Linguee Yandex
One must be careful before committing oneself, after one must continue.
In the making
The concern shall be clearly described, shouting results in danger. Explain the situation to one's entourage. Avoid any brutality and do not divert.
Proof (Pivot's method)
One switches activities when necessary, or else one continues.
The other does not want to say yes immediately.