It was hidden from John Mosley , also known as The Rogue, who was intent on acquiring it. September , who as an Observer was unable to get involved, tasked Walter with hiding the beacon until it disappeared so that Mosley could not get his hands on it. Walter took it to the grave of a relative. Mosley abducted Peter and began to interrogate him. He hooked Peter up to a mysterious machine that would enable him to read Peter's thoughts. Through a series of questions, Mosley was able to predict where Walter hid the beacon. The beacon burrowed its way back into the ground before it could taken by Mosley.("The Arrival")