(i) The given line was spoken twice in the play. First, it was spoken by the intruder when he revealed to Gerrard why he was there and what he was going to do with him. On the second occasion, it was spoken by Gerrard when he was about to reveal his made-up story to the intruder.
(ii) When the intruder said this line, the surprise was that he was going to kill Gerrard and take over his identity. He told him that as Vincent Charles Gerrard, he would be free to go places and do nothing. He could eat well and sleep without having to be ready to run away at the sight of a cop.
When Gerrard said this line, the surprise was his made-up story about himself. The story was that Gerrard himself was a criminal like the intruder. When things went wrong with him, he had committed a murder and got away. Unfortunately, one of his men was arrested and certain things were found, which his men should have burnt. He said that he was expecting some trouble that night and therefore, his bag was packed and he was ready to escape.