From the Folklore of the Sakai
On the east side of Gunong Renduai, in Ulu Bertang, in the Kinta district of Perak (near Sungei Siput), the low-lying reaches of which are now known as S. Batu Putih, or “White Rock River,” there is a hollow (“gugup”) in a steep and inaccessible wall of limestone, at about half its height. This is the nest of the “K’lang B’lok,” a giant eagle, which at one time nearly succeeded in destroying all human beings. Only two persons had managed to escape, both the youngest members of their respective families, a boy called Ba-lut (“Youngest Son”), and a girl called Wa-lut (“Youngest Daughter”). These two owed their safety hierto to the possession of a magic knife (called jehud paung).
When they found that they had alone escaped with their lives, the youth approached the maiden saying, “Marry me?” The girl replied, “All right! If you will cause the K’lang B’lok to die, I will be your wife.” The boy replied, “I will kill the K’lang B’lok.” After saying this he climbed to the cave and waited for the return of the giant bird. It was then about noon, but suddenly the sky became dark, and the sun disappeared behind the wings of the bird, the rustling of which was like the sound of thunder (“ngkuh”). Ba-lut then stretched out his right arm with the magic knife, which proved to be so sharp that in its flight the approaching bird cut its own neck against it and died. Then Ba-lut married Wa-lut, and they two became the ancestors of all the people now living in this world.
Sources:
Part 3, Chapter 6, Pagan Races of the Malay Peninsula, Walter Skeat, Charles Blagden, 1906
Kotharian Lightning 