Misha should have tried harder to get rid of Janina. For one reason there were a bunch of flops and Nazis and Big Henryk was standing on the wall with Kuba. And if they spotted them they will go back to the ghetto. Plus Misha has to go by himself and if Janina and Misha started arguing Big Henryk will stop them. And also if they get caught they will be hanged just like Olek because he is a smuggler. Another reason is Misha has to go by himself to the secret location where Uri is and doesn’t want anyone to know where it is. Finally Misha should have tried harder because Uri has specific directions for Misha which Uri doesn’t want anyone else to know and what he told to Misha “Don’t look guilty” So those are the reasons.