Vocabulary: When Moroni says he “cannot recall the words which I have spoken” he is not using recall as “remember” but rather as “bring back.”
Social: Why cannot Moroni accept Zerahemnah’s offer of surrender? Moroni had offered surrender with a condition, and Zerahemnah did not accept that condition. Why cannot Moroni change his mind? Certainly accepting the surrender will save lives, why not accept it? Moroni had sworn upon God. That was binding. Moroni could not change his mind because he had invoked God in the declaration of his offer.