Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

Q: In Flash season 4 episode 18 (Lose Yourself) Devoe attack star labs and take the powers of all bus metas. He even takes away the power of Killer Frost. He could easily take the power away from Barry as he was laying on the floor or he could absorb his power too. Same in the case for Cisco.  So why didnt Devoe takes Flash's power?  Is it because Devoe can only absorb the powers of the bus metas?

A: Why didn't Devoe take Barry's power?
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Q: In Capricorn One, the NASA mission control center maintains fluent communication with the spacecraft crew, which is obvious especially in the scene where the astronauts talk with their wives, even though the spacecraft was so far this would be impossible.  I would consider this just another logical glitch in the movie (which is full of them, IMHO), but the fact the signal from the spacecraft takes 21 minutes to reach Earth is repeatedly stressed in the movie just prior to these scenes. So I wonder, did I miss something? Is there any explanation, or is it really just an (obvious) error?

A: How is the fluent conversation with spacecraft possible in Capricorn One?
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Q: In Dracula (1992), in the scenes in the asylum where Renfield is being held, the guards can be seen wearing cages on their heads. Why? Was this a normal practice? I have heard of head cages for inmates but not guards. I'm not sure what the purpose would have been other than protection, but give the rest of their body is unprotected there has to be more to it. I've included the best image I could find. If I can get a better one I will update.

A:
Why are the asylum guards wearing cages on their heads?
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