Coming down out of heaven (katabainonta ek tou ouranou). Present active predicate participle. Not the angel of Rev 17:1, Rev 17:7, Rev 17:15 (John’s guide), but one announcing the doom of Babylon (Rome). As in Rev 10:1; Rev 20:1.
Was lightened (ephōtisthē). First aorist passive of phōtizō, old causative verb (from phōs, light), common in N.T. as in Rev 18:1; Rev 21:23; Rev 22:5.
With his glory (ek tēs doxēs autou). “By reason of (ek as in Rev 8:13; Rev 16:10) his glory.” “So recently has he come from the Presence that in passing he flings a broad belt of light across the dark earth” (Swete).