He might be trying to escape from someone or something. He probably thought jumping was his best option at that moment. However, he could face serious consequences, not only from the fall but also from the theft he committed.
Since he's a comic book thief, he could be a comic book fanatic who couldn't resist stealing them. As for his appearance when jumping out of the second story, he might be in a hurry, with his clothes in disarray and a panicked look on his face.
One of the things that makes 'The Book Thief' stand out in historical fiction is its ability to blend the big historical picture with the small, personal stories. We see the large - scale events like the war and the Holocaust, but we also get to experience the daily life of Liesel, her family, and her friends. This combination of the macro and the micro makes it a truly outstanding piece of historical fiction.
The story is set during World War II and follows a young girl named Liesel who steals books and finds solace and strength in them amid the chaos and horror of war.
It can be seen as having elements of love, but it's not a straightforward love story. The main focus is on other themes like survival and the power of words.