Atticus is questioning Mayella now. First he's asking her about her friends and family. Mayella is scared of Atticus because she thinks he is making a fool of her as he looks out the window. She thinks this because Atticus made a fool of her father before.
Atticus tells Mayella to identify Tom, and as he stands up you can notice one of his hand is bigger than another due to an accident.
Atticus does not believe Mayella and makes her restate herself. Mayella starts crying and says " Tom took advantage of me, if you fine fancy gentlemen don't wanna do nothing about it then you're all yellow stinkin cowards"