HT, so they taxy out again and the kids plays up again, so they return to stand again and the kid calms down again, so they taxy out again...... ad infinitum.
Just like offloading bags for passengers who fail to get to the gate on time, and then once the bags are off pitch up and want to get on the aircraft. Once you start a process you have to see it through to completion otherwise not many aircraft would ever go anywhere with constant disruption.