What is the difference between "hot" and "cold" anger as mentioned in this chapter?

Bonzo's anger was hot while Ender's anger was cold. Hot anger was anger that consumed the person. Hot anger, as in Bonzo's case, disorients a person causing rash and unwise decisions. Ender's anger was cold and calculated. Ender's anger reacts to Ender and not the other way around. Ender is able to put his anger in perspective and effectively fight whatever obstacle he has with intelligence and cool manipulation.