That is just a costum when the Borneo tribe make a ceremony of his culture that about warrior dance
(war dance). The people of Birneo tribe alway use the costum when the ceremony are making.
As we knew, that the indonesia country had some tribe and comunity that have the culture of themself. That is make the Indonesia country so interest as a tourist destination with the peoples of other country. We can see that, nany strange people (bule called by indonesian people) fall in love with the cultures of indonesia.