The track may be like Roli hug Sid and as he is afraid that Shruti is trying to take the place of Roli he throw her out..
But after throwing her out Shruti goes somewhere while she get back her memory & when returning Nagin meet her on the way.. Nagin keep her hand on Roli's head which may again hypnotyse her to forget her again...
In the meantime Sid will be told by Mataji & Simar that Shruti is his Roli & whatever happened...
Then she may be kept somewhere while Sid who comes to know the truth may go in search of Roli with Simar...
Hope atleast this happen...