Earlier when Advait's father ordered his goons to take care of Nehmat, Advait stopped the attack and managed the situation. So going by his actions I feel that Advait is not into killing.
Also, if Advait turns completely negative then Ekam-Nehmat - Advait love triangle will not work.
@Red : Yes, if necessary Advait might change his ways.
@blue - Yes but then atm Advait played the drama of saving Nehmat to win Nehmat's trust.
Advait said to his father that he wants to separate Nehkam by using Nehmat's trust on him.
@red - It can work if the CVs want to keep Advait negative throughout and make Nehkam the endgame.