"Staying angry" was one of the original definitions of Choleric, but once again, there's traits, and there's root definitions. The traits are only possible results of the root factor. So what it translates into now is task-focus. For the NT (and SJ), task focus is what Berens calls Structure focus. It doesn't necessarily make you more angry, but it is less people-focused than the Motive focus of SP and NF.