Yes that's true that he has observed Arohi the best and now after the observation he knows very well how will she react at each situation and he knew that well in spite of liking that neckless she would never accept that. I loved the way he demonstrated each and every move of her and yes she was doing the same things. I loved their smile too which Arjun n Arohi gave after briefing Arohi's reaction.
sometimes I think that Arjun knows Arohi better then she knows him. I loved how he kept on talking through what she is doing in the room and Arohi would do exactly what he says. An awesome scene which again demonstrates Arjun's love for Arohi.
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