This is the scene where Liesel spots the SS and hurts herself so she can warn her family. While Liesel is playing soccer with the boys she falls and cuts open her knee. They stop the game and Liesel runs inside just in time.
In the book, Liesel finds Rudy's dead body and finally kisses him. This is very significant because Rudy was always asking her for a kiss, although he knew she would refuse. Rudy was in love with Liesel and Liesel was secretly in love with him too.