This also makes a lot of sense...Kareena and Saif are the main adults in the appartment and in a time of such a shocking incident, it is important that the kids get the needed attention and support by their parents.
I suppose that Taimur was adamant to go with Saif (and this decision had to be made quickly as the adrenaline still held Saif alert but the bleeding made clear that he had to get medical treatment). Kareena would be the one to get into action at home (caring for Yeh, making the calls to the friend/manager, the family and police).
As they had put the intruder into a room and descended to the floor below they didn't get aware that the intruder could escape.


20