τὸ δρᾶν: for the art., cp. 118 n. τίς ἔσται μ᾽ οὑπικωλύσων τάδε; for this use of the fut. partic. with art., cp. O. T. 297.Dindorf is not quite accurate in saying that, after “ἔσται, οὑπικωλύων” ‘would have sufficed,’ and that the poet preferred the fut. partic. only for the sake of correspondence with “κωλύσει”. The fut. partic. was required by Greek idiom, whether the principal verb was to be past, pres., or future. Cp. Xen. An. 2. 4. 5“ὁ ἡγησόμενος οὐδεὶς ἔσται”, ‘there will be no one to lead us’ ( Xen. could not have written “ὁ ἡγούμενος”). For the place of μ̓ cp. Soph. O. T. 139“ἐκεῖνον ὁ κτανών”. The compound ἐπικωλύσων comes after the simple κωλύσει as in Soph. O. T. 566 f. “παρέσχομεν” after “ἔσχετε”, ib. 575 f. “ἐκμάνθαν̓” after “μαθεῖν”. Cp. above, Soph. O. T. 249: and for the converse, Soph. O. T. 911 f. τάδε: for the double acc. (a rare constr. with “κωλύω”), cp. Lys.p. 207 E “ἐμέ γε...καὶ μάλα πολλὰ κωλύουσιν” (sc. “οἱ γονεῖς”).