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Cole still has not learned to take responsibility for his actions. Edwin knows Cole. Eswin was once like Cole and he knows that Cole is far from ready to deal with his pain. I'm not sure what you are referring to at the very end of your question.
Sorry aslan I meant to ask "Cole briefly considers the possibility of taking the skiff and returning to the mainland. However, even if he had tried, Edwin had removed the spark plugs from the engine, so it would not have worked. What does this incident tell us about Cole, Edwin, and Garvey?"