This is called Ekhro-Kechu, a warrior dance depicting power, might and agility performed by victorious warriors through ages.It is also called as victory dance performed after the battle to celebrate its victory.
Certain Code of Conduct must be followed while performing this heroic act.
Imitating after a Hawk hovering over the sky ready to swoop down to prey upon its enemy, the warrior with its flexing arms and open chest leap onto the air and stamp vigorously his foot on the ground twice and sprint forward to a certain position where the earlier act is repeated.
During the head-hunting era, it's an authoritative gesture challenging the opponent for a dual fight.