Well it's a tough choice.. .I absolutely loved the scene which you mentioned as it brings to fore the conflict with in Ansh...
But my favourite would be the staircase scene when he crosses over to hold her hand to lead her in the darkness.. That was pure chemistry and the tension between the two was thick enough to cut by a knife... And also cuz this scene also highlighted the conflict with in Ansh.. And the library scene which you mentioned is a very close second for me..