By analyzing the picture provided,i come to the conclusion that librarian is lieing
my analyze is as follow.
Books are scattered near the door and no sign of someone exiting through it. if someone had exited through that door,books would have moved in the direction of the door swung open.
if someone says door can be opened the opposite direction without disturbing the book - i will say door fitted inside the building always open inward,as safety precaution,plus the hinges fitted shows door opens inward.
The librarian was pale andfrightened
maybe because of guilt or fear of getting caught.
librarian ransacked the place after the thief left the scene.