Board Thread:The Flash discussions/@comment-9346948-20161012044349/@comment-7890302-20161014231822

Steven Bomb 17 wrote: Kaestal wrote: We saw him being harassed by a dude in prison, not killed. Really I thought he died because Dr Alchemy was all "You failed me!" And then the scary hand of death grabbed The Rival's throat

For villians, that's it. Unless you kill him, when your evil boss says you failed, you're dead.