it was subtly done..but he consciously controlled his body from hurting her too much..
before this in his anger, he has never cared to control his physical strength in using it to overpower Khushi..somehow i think they did a pretty good job today with this very very subtle change in Arnav's behavior!!
EDIT to add
this is not a post justifying him manhandling her..but the character progression..a subtle touch to acting..i want ur honest opinion..don't bring the justifying part in to this discussion cz this is about character evolving..
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