That bhoot is obviously Mohitwa who comes to SS after Chanda tips him off , remember he knows SS inside out , so he knows which way he can enter and get out of it without getting caught
I liked how mahan murkh mahila screamed and went dizzy , only an imbecile like her will yell like that inspite of seeing that comic act by that bhoot .
Another ploy by Chanda to oust Riya and now all fingers will be pointed out towards Riya obviously sincw she wasn't sleeping in her place yesterday.
Anyways , if Riya really leaves SS as shown in precap , it'll be great . Those words she said were very sweet to hear..