The same holds true for leadership. Effective leadership comes from practice for the judgement call that might never come. Leadership is studied, drilled, and honed with experience so that we know how we are going to behave and, more important, people around us know, as well. When the people we lead learn to trust our leadership, then they are free to do their jobs without fear. Make your decisions based on facts, not emotions.
Fire fighting is no place for emotions.
And neither is leadership. I'm not saying that you must put your feelings aside and deny your human side. I'm saying that, in leadership, cooler heads prevail. Part of consistency is making decisions based on facts - evaluating the situation, weighing the options against the possible outcomes, scanning your experience, and then making a judgement. How you feel should not be considered.