Shanti is not dead....RM said na dekho deadbody chalke aa rahi hai....it was a trap for Pragati...show her something horrible so she goes running to tell RM and when they come back there is nothing there....So now Prags is proved either lier or imagining things....either way RM won't trust her and relate everything to the experiment thing probably...and so when she finally tells her Bani murder truth he won't believe her.... so criminals are safe....and it worked it seems....shanti was probably blackmailed into silence...she is just a servant there....
Got it,, and what was that family discussing in the precap