ἐπὶ τῷ μὴ κοινωνικῶς χρῆσθαι τοῖς εὐτυχήμασι → for not having used their success in a spirit of partnership
ἐπιβείομεν: Ἐπικ. ἀντὶ τοῦ -βῶμεν, καὶ ἐπιβήμεναι ἀντὶ τοῦ -βῆναι, ἴδε ἐπιβαίνω.
1ᵉ pl. épq. sbj. ao.2 de ἐπιβαίνω.