In the example above, various clauses stretch out both horizontally and vertically around "LE MAÎTRE," thereby qualifying his already-precarious situation. Note that the verb "surgi" (rises), falls under the Maître. Also, by being capitalized, "LE MAÎTRE" participates within a sequence of capitalized words from other pages in the poem: "SOIT... LE MAÎTRE." He participates within multiple clusters which render his position hypothetical.
Note that the verb "hésite" can accept two separate subjects: "LE MAÎTRE" and "l'unique Nombre"--while the former is preferred, the latter remains a possible suggestion due to the spacing of the units on the page. The syntax of this second possibility is awkward--since then the MAÎTRE would be left dangling without a finite verb--but still remains plausible. Indeed elsewhere, Mallarmé deployed such awkward syntax: all-too-frequently substantives and substantival units takethe place of verbs; from Le mystère dans les lettres: "sitôt cette masse jetée vers quelque trace que c'est une réalité" (‘uvres complètes, eds. Henri Mondor et G. Jean-Aubry, Paris: Gallimard, 1945. 121; cf. Jacques Scherer, Grammaire de Mallarmé, Paris: Nizet, 1977. 103, 121).
(The aligments here are based on the Ronat edition, which most closely follows the directions on Mallarmé's page-proofs.)