Saw the angel,
He was terrified.
Fear overwhelmed him.”
καὶ ἐταράχθη Ζαχαρίας ἰδών, καὶ φόβος ἐπέπεσεν ἐπ’ αὐτόν.
Luke noted that when Zechariah saw this angel (Ζαχαρίας ἰδών), he was terrified, troubled, or disturbed (καὶ ἐταράχθη). Fear or reverential terror (καὶ φόβος) came over him or overwhelmed him (ἐπέπεσεν ἐπ’ αὐτόν). A supernatural presence or an extra-terrestrial non-human would scare most people. Luke often emphasized this religious fear or awesomeness for God and his messengers.