Raman interacts with Shagun only for his son Adi, otherwise we always see him mocking and taunting that woman. There is no chance he can go back to that evil woman. As to the blood test scene, I think he takes along Ishita as I saw a pic earlier here of the three of them in the hospital, I guess. I want him to take along Ishu, can't tolerate that witch with him alone anywhere.
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