HIS wife had called out, inviting the family in to their mud-and-thatch hut for lunch, when farm-worker Khetra Bag saw the sky turn red and dust clouds swirling around him. Then his world turned black. There was a resounding crash, and his two teenaged sons playing outside flew out into the storm as Bag watched in horror, crouching near a haystack. A minute later, wife Kaushalya lay dead under a debris of baked mud, thatch and wood, blood oozing from her forehead. The two sons, Lakshmikanta and Purnachandra, hurled by the winds into a shallow pond nearby, floated numbly in shock. A day after last Tuesday, Bag kept a tearful vigil over Kaushalya's lifeless form. "It was all so sudden," sobbed Bag, "that I don't even know what happened."