After the third knock, Sophie noticed the door move a little. A fourth shot slammed into the door, sending splits flying. Sophie quickly closed her eyes again, realizing that she was trying to break down the door.
A sudden stop
When Sophie opened her eyes, she realized the door was still in place after noticing a sudden stop in the banging. She heard the police talking to each other, but it didn't sound right, so they had to find another solution. Since breaking down the door didn't seem to work, they had to find another solution.