Matt notices something in the sand; torn fragments of Chris's clothes... near the same spot where he apparently vanished.  the fragments appeared to have been bleached in some spots, burned and eaten away by an acidic substance of some sort...  He then realized the fate of his brother.... he was eaten alive, and his clothes spat out.... One of the predators on the island must have caught him.... And swallowed him to his doom... But he knew the risks... and his brother, though smart wasn't the fastest of runners...<br/>Matt felt safe though... He had no Idea of what ate his brother but assumed they were long gone...