If Laali can convince Shekhar to help her save Nadini and then have him drive like a banshee to the Haveli, the two cars would end up on the same road.
This time, if he has it, Shekhar's pistol could come in handy.
I think the trio will get there first, break Kau bedroom door and interrogate her, and be just about to kill her when Shekhar and Laali will arrive.