Emily Thorne survived her fight with Kate Taylor thanks to Daniel's sacrifice and Jack's quick trigger. The fallout continues on Revenge Season 4 Episode 11.
In the Revenge mid-season finale, Jack Porter killed his sort-of girlfriend Agent Kate Taylor while saving Emily Thorne. He'll face up to his actions on Revenge Season 4 Episode 11.
Margaux: You're just like your father and mine. You do what you please and ask for forgiveness later. I need a man who doesn't make rash decisions. Daniel: Really? Because you had that with Jack Porter and you needed more.