Board Thread:Episodic and Issue Discussion/@comment-5008987-20130317001647/@comment-1038387-20130323185611

50.58.200.3 wrote: i know greg said there is no speed force but he could have changed his mind and used wally's "death" as a way to introduce the concept later.

because wally fading out sure looked like speed force after images to me

He doesn't like the concept. That's why it wasn't used.