The whole VIP switch task was designed to give Nishant the power to decide who to oust and who to take in VIP zone and he played well.
But since than he has been behaving like a sore loser, either its coz he feels guilty or thinks Teja and Karan will get lots of sympathy by not saying anything and quietly going about their routine or he wanted a big showdown with them, which he didn't get.
When teja got teary eyed for being attacked by Nishant and Pratik subah subah even before breakfast, he was insensitive towards her.
Later he tried playing the wronged one, by saying he wouldn't eat food made by Teja as that was now Zeher for him. And then the whole day spent in bad mouthing teja and karan.
So though he won the battle, he's losing the war now with his bad mouthing and trying his hardest to show karan n teja negative and he has involved the whole house against bad mouthing them.
All this happened in yesterday's LF. Don't know if the makers will show it in the episode, as they r so hell-bent on showing teja negative.