Board Thread:The Flash discussions/@comment-9346948-20171108005845/@comment-5441128-20171114132040

Well, I don't think it's matter of control because Caitlin has to sleep sooner or later like if she goes to sleep and Killer Frost wakes up and goes out. I think she is waiting for them to do the first attack. Like in the episode. Cause and Effect she did came peacefully and did not kill anyone and when some was about to fire at her "You fire, I will fire."

Killer Frost: Can't really avoid that now, can we?
 * Killer Frost: Now you want to fight?
 * Cisco: We don't want to fight you.

Yes, she is always on the edge of attacking, but I think she can change, besides she didn't really kill anyone even Savitar said that.