17. ἔπεσα … νεκρός. So Dan 8:17 sq., Dan 10:8-9; Dan 10:15 (Eze 1:28; Eze 43:3; Eze 44:4 do not necessarily imply so much): cf. Exo 3:6; Exo 20:19; Exo 33:20; Jdg 6:22; Jdg 13:22; Isa 6:5; and also Luk 24:37; Joh 21:12. St John was in presence of both the sources of supernatural terror—of God’s Presence made manifest, and of One come from the dead.
ἔθηκεν. So in Dan 10:10 a hand: Dan 10:16 ὡς ὁμοίωσις υἱοῦ ἀνθρώπου Dan 10:18 ὡς ὅρασις ἀνθρώπου touches the prophet: in each place the touch is followed by encouraging words.
ὁ πρῶτος καὶ ὁ ἔσχατος. i.e. the Eternal, as Isa 41:4; Isa 44:6; Isa 48:12; the ancient (? Arianising) variant πρωτότοκος suggests that as the Firstborn among many brethren, the inheritor of an everlasting kingdom, the Son even in His Manhood is an Image of the Father’s eternity.