Why does no one take Hannah/Chaya seriously when she begins to tell about nazis?

Hannah realizes immediately where she is and the danger they are in. The badchan points at the men and says he sees the Angel of Death. She tells Reb Boruch that the men in front of them are Nazis and that they will kill them all if they do not run away. Reb Boruch tells her that she should not fear mere men, only God. People already think that Hannah is full of odd stories so they do not take her seriously.