The Haaru are historically a very warlike species. Many of their cultures developed a dueling tradition that has a major influence on Haaru Culture to the present day.
Dueling Traditions
Origins
The swirling melee is particularly unfair for a centaurian branch-dwelling species - compared to a human standing on a flat battlefield, the Haaru has a third dimension of potential threats to worry about, not to mention a circular topology that can conceal additional threats.