The name of Sybil Rowan applies to two different characters in Act:10. The first is an actress and anti-government activist imprisoned for opposing the founding of Paradigm City. She starred in "Winter Night Phantom, a movie Dastun saw as a child and now remembers as a recurring dream.
The second character is the bomber featured in the episode. She identifies herself as "Phantom", after Rowan's film. Her death, at the hands of Dastun, parallels that film's ending.
The film is seen again in "The Big Fight".