They took on the personalities of each other starting in this scene. I think this may be a theme of Ferit's mood change and being the walking dead. He has become Seyran and is dying.

I interrupt this as Ferit's way of taking on Seyran's illness and when she collapses at the figurative hands of Suna, it will be Ferit that once again puts his life on the line for her and Seyran will remain healthy and alive. 

So my question is does Suna take out Seyran, who is actually turning into Ferit? I think she just might. She will kill them both.