Why didn't Team Flash just ask Killer Frost to freeze the building that was on fire? That would've stopped it. She wanted to restore Barry's memories, so her main priority wasn't him trying to save people. If she just helped, they could've gotten back to the task more quickly. I hope that Caitlin and Killer Frost's personalities merge next season so that she can be both while remaining a hero. Cisco even mentioned the Star Trek episode "The Enemy Within", although that was in relation to Barry and his evil twin. But what if something similar could be done with Caitlin so that they aren't effectively split personalities? Then she could become Frost whenever she needs to, and maybe she becomes more sexy and sassy when she transforms (like She-Hulk) but she is still good.