You are correct, they are not related. This is called sarcasm. She said that it doesn't sound to hard to amaze yourself to him, but its sarcasm, she was joking, meaning like he is full of himself, self boasting, so she made a sarcastic statement as a joke, Then the next sentence goes on about the escape, so you are correct, the rest of the meaning has nothing to do with the sarcastic one line statement she made.