He lines up his putter with only his right hand, gripping conventionally. Then he adds his left, conventionally, to the top of a slightly longer shaft. Then he switches the right to a hammer grip, riding the club six or so inches below the left. Then without pause he pulls the trigger. He says this takes the dominant right hand out of his stroke and helps eliminate pulled or sliced putts.
Woods sometimes works the same tee shot left and right.
I just have to play the course. Imagine Woods admitting he was driven by a story by the Tribune's Ed Sherman that appeared in Friday's Augusta Chronicle. You might not see him Friday. Pre-'97, you almost surely wouldn't have. Then, only the long survived.