This paper by Handel, Carlson, and Leitner examines phase shifts as the cause of ball lightning motion, presented at the 2nd International Symposium on Unconventional Plasmas. The work proposes that spatial gradients in the electromagnetic phase of the atmospheric maser radiation drive ball lightning movement through momentum transfer and radiation pressure effects, explaining why ball lightning can exhibit controlled motion, hover in place, or move in directions independent of air currents based on the local electromagnetic field configuration.