In "Great Expectations", what does Pip learn from the two convicts he overhears on the stagecoach?

Pip overhears one of the convicts (the one he recognizes from the Three Jolly Bargemen bar years ago) talking about a convict who (from the marshes in the beginning) asked him to deliver two one-pound notes to a kid by the name of Pip.  The money was for his "service."  At this point, Pip knows that it was the first convict who gave him the money, not Havisham.  He also learns that the first convict was again tried and was given a life sentence for breaking out of prison.  Upset at his findings, Pip jumps off the stagecoach as soon as possible.