As far as I can understand, what Sid is trying to do is.. fist getting into good books of Shabby, be her only support system, scare her to the maximum so that she comes and confides all her crimes to Raghu.. Now Shabby has no one whom she trusts, once Raghu becomes her trustworthy person and she becomes so scared she may go and talk with Raghu😆 and thus he can trap her by recording the confession..
As of now the plan is going towards success but at any point if Shabby gets doubt that RaSi is Sid.. his plan will flop big time😆 I really hope SidNi restrict their romance so that they won't get caught by Shabby😛