Well, no one is positive and that's what I like about them. Be it Piya or Naman. Even Dil is not entirely possible because she did bring Saavi to please her mother if I am not wrong. But apart from Mo, and in the initial phase Naman, PiyAnsh or Dil or Team R - they never tried to harm anyone unless it was absolutely necessary.
Today, he had an option yet chose to kill Angad. Even Piya used her khanjar knowing it can't harm Rahul as long as she doesn't want to. But Ansh took it too far this time.
That's what I think. You can decide once you have seen for yourself.