The terrace scene might be just to scare us, but the rest might be to expose Ayesha.
Milind will bash up the kidnapper and he will tell him, that Ayesha was the boss and it was her plan. Milind getting pissed, goes to Ayesha and starts screaming at her for playing with Rithwik's life, and in between sees that M on her palm and start screaming at her again. Ayesha loses it, like she lost on the Dandiya night and start screaming at him about what all she did to get him, and she will tell him that she knew that Rithwik is Sukriti and Alaap's son, that she had bribed the lawyer and doctor so that the divorce cud go thru, then hopefully abt the fake ONS. And after hearing all this, Milind will be so angry with her, tht he breaks off his relation(i.e. friendship) with her. Ayesha might be too heart broken, and she might leave Shah house, and this way, they can concentrate more on Milind being blackmailed track.