How was it finally proved that …

The governor of the HM prison, Oxford, appears to be kind hearted fellow at the start as he arranges for an O-level exam for a prisoner renowned for his disability to escape. He was though ,quite skeptical of Evans and made every arrangement to make sure that Evans had no means to escape. He was also very proud and self conscious. He did not want Evans to disgrace him by escaping from his prison. He had a sharp presence of mind, which was clear from the fact that he cross checked every call that was made to the prison that day. However he got overconfident of his arrangements and gave Evans the opportunity to escape. Also, he was a person who did not mind showering praise on a prisoner. When Evans revealed the secret plan to him, he admired him. At last, he proved to be just another good -for -a-giggle, gullible governor when Evans again tricked him and successfully escaped. His overconfidence and self praise let him down.