BR's main aim is apu darling...but i guess he attack mohini becos he knows she is related to apu...if something happens to her apu will definitely come...thus he attack her the first time..but whenever mohini hears of BR...she is scared and guilty...i guess there is some mystery to it too...things are getting complicated and interesting...lots of secrets and mystery...it will unravel step by step...Rishna got saved tdy due to apu...his main target is apu...i do hope mohini is not another yamini of Naagin