So, that thing can't be an accident though, because it is such an unlikely thing to show in that scene otherwise. We all know that decoration is something that is only for upari dikhava (show-off). It is just for show off. It has nothing to do with the matters of heart or emotions. Same is the case with the relation (or the lack of it) between Antara and Satya. It is like that piece of decoration. A facade to the show the world. There's no more importance to it than that. So, that piece of decoration falling off at Antara's feet when she walks past Raghu in a way signifies that the facade will fall off in front of Raghu, that too at Antara's feet. The dikhava (facade) won't last long. It will fall off soon enough. And anyway, Raghu and Antara's relationship is very deep, and beyond any dikhava, or facade. It is a connection of two souls, which will not be hidden behind any facade for long.