How to slice a Bagel into two linked halves

Just in case you need to slice your bagel into two linked halves for breakfast, George has a solution: "It is not hard to cut a bagel into two equal halves which are linked like two links of a chain. These sharpie markings on the bagel are just to help visualize the geometry and the points. You don't need to actually write on the bagel to cut it properly."