I think swara could always sense sanskar...I remember a scene particularly...it was during the phase sanskar was acting mad and wanted ragini at any cost with him at MM...so Lucky after promising dadi to marry her gets both the sister's there...when swara and ragini were going home, it was shown that sanskar was looking at them from above and thought to himself that he would never let lucky get his love and he takes swara's name in his thoughts...the moment he takes her name, swara instinctively turns and asks ragini if she said something to her and after her denial she automatically looks above and as if sensing that swara might look in that direction, sanskar steps back...I liked that particular scene for the connection...and it clearly foreshadowed the future...and that was the first hint towards swasan...