When they decided to pay Allen a surprise visit, Sophie had sent the driver home so Eugene could take them to the company. She wanted Allen to come home with them in the same car, have dinner together, and take Eugene and Hannah home afterward.
Since Tobias was getting too excited about meeting his father, and Hannah couldn't stand the smell of a basement parking lot, Eugene dropped them off at the lobby and parked the car himself.
Certainly, Sophie did not expect the kids to run off the moment they came out of the elevator, forgetting that Hannah didn't like its smell either.
Certainly, she did not expect Tobias to trip on the carpet, causing Hannah to fall backward.
And certainly, she did not expect Arthur to be in her husband's office, unknowingly saving his own daughter from a possible concussion.
