Sam to Reign (and fate of Ruby)

Yeah Ruby won't die, but the DEO probably will take her away once her mom starts causing problems. So its a shame that after all these years of being normal, its the signals from the pod...Also maybe tuned in to kryptonian minds? Maybe thats why Kara and Reign are getting the same dream?

Maybe Reign tries to unlock the latent world killer genes in Ruby too after she's really far gone, and thats where the gang all pitches in to stop her.

Yeah the scene with the random pod in the bedrock confused me. Reign left in the EXACT same Kryptonian pod as Kara and Clark. I thought the camera was following Kara as she flew back into the ocean. I was assuming they were showing her heat visioning the bedrock cracks back together, but there sat a random ship/non pod. I'm thinking it's PSI's ship, perhaps? And Reign was actually only triggered by the adrenaline and stress level, which would make more sense since she's genetically engineered. Also, Sam/Reign was clearly found as a baby. So, the pod wouldn't be embedded in bedrock.

I believe we found out what is causing Sam to turn into Reign. It looked like the explosions on the waterfront disturbed her buried pod which started giving off signals after she got a mega adrenaline rush saving Ruby. Reign is a Worldkiller so once her abilities kick in she's gonna be bad. The drama is going to come from her trying to fight it.

As for Ruby see the thread where we talked about her https://supergirl.tv/forum/supergirl-getting-a-sidekick-in-season4. Most of us are assuming she won't die. I'm not sure the network has the stomach to kill a kid.