The example illustrates that being a limit of equilibria of perturbed games, an extensive-form trembling hand perfect equilibrium implicitly assumes an agreement between the players about the relative magnitudes of future trembles.
ðɪ ɛɡzˈæmpəl ˈɪləstɹˌeɪts ðæt bˌiːɪŋ ɐ lˈɪmɪt ʌv ˌiːkwɪlˈɪbɹiə ʌv pɚtˈɜːbd ɡˈeɪmz, ɐn ɛkstˈɛnsɪvfˈɔːɹm tɹˈɛmblɪŋ hˈænd pˈɜːfɛkt ˌiːkwɪlˈɪbɹiəm ɪmplˈɪsɪtli ɐsˈuːmz ɐn ɐɡɹˈiːmənt bᵻtwˌiːn ðə plˈeɪɚz ɐbˌaʊt ðə ɹˈɛlətˌɪv mˈæɡnɪtˌuːdz ʌv fjˈuːtʃɚ tɹˈɛmbəlz.