I was just watching that Harshad attack wala epi last night actually...lol it's quite fresh in my mind...the way Nandu is horrified that Dhruv wasn't there...the way she flashes back to Manik saying he always had it under control...the way she tells him he HAS to listen to her and she WON'T let him go on the wrong path and he needs someone to save him from himself...and Manik says he WON'T listen to her.
Dude, essentially that whole track of "trapping" Harshad was Nandu's attempt to keep Manik out of JAIL...lol...she always felt his tendencies would land him up there only...and look where we are today...despite all the heartfelt confessions...if Nandu didn't somewhere fear this only, she wouldn't have said it.
Nandu ka savior complex has always been on...trying to save Manik from going over the edge, committing murder possibly...this has always been in the back of her mind...today it all just manifested itself at the worst possible moment.