High levels of ambiguity in an emergency (e.g. an unconscious man lying on a park bench) make witnesses less likely to offer any sort of assistance, due to the fear that they may have misinterpreted the situation and acted unnecessarily.
hˈaɪ lˈɛvəlz ʌv ˌæmbɪɡjˈuːɪɾi ɪn ɐn ɪmˈɜːdʒənsi ˈiː.dʒˈiː. ɐn ʌŋkˈɑːnʃəs mˈæn lˈaɪɪŋ ˌɔn ɐ pˈɑːɹk bˈɛntʃ mˌeɪk wˈɪtnəsᵻz lˈɛs lˈaɪkli tʊ ˈɔfɚɹ ˌɛni sˈɔːɹt ʌv ɐsˈɪstəns, dˈuː tə ðə fˈɪɹ ðæt ðeɪ mˌeɪhɐv mˌɪsɪntˈɜːpɹɪɾᵻd ðə sˌɪtʃuːˈeɪʃən ænd ˈæktᵻd ʌnnˌɛsɪsˈɛɹᵻli.