ἀναβοάω The form ἀναβοάσω is aor1, not future.
1.to shout aloud, utter a loud cry, Hdt., Eur.; of a war-cry, Xen.; c. inf. to call out that . . , id=Xen.
2.c. acc. rei, to cry out something, Eur.; also to wail aloud over a misfortune, Aesch., Eur.
3.c. acc. pers. to call on, id=Eur.