It was in retrograde (against the direction of travel) and slowed the spacecraft down by , effectively reducing the closest distance at which the spacecraft would pass the Moon.
ɪt wʌz ɪn ɹˌɛtɹoʊɡɹˈeɪd ɐɡˈɛnst ðə dᵻɹˈɛkʃən ʌv tɹˈævəl ænd slˈoʊd ðə spˈeɪskɹæft dˌaʊn bˈaɪ , ɪfˈɛktɪvli ɹᵻdˈuːsɪŋ ðə klˈoʊsɪst dˈɪstəns æt wˌɪtʃ ðə spˈeɪskɹæft wʊd pˈæs ðə mˈuːn.