Ok guys I watched the episode today again and this time the quality was good......And
It reinforced my first opinion that the look Pia gave was not of love and happiness for her sister. Neither was it of resentment (not of yet). But it was like she was not very happy at what she was looking at. Till now she was under the impression that Jai was in love with ME THE PIA but now she saw a different angle to the situation.
I amd again sticking to that Pia is going to be the third angle to Jai-Bani triangle.