سُبْحَانَ ٱللَّٰهِ
Holy Qur'an
Al-Qur'an
Kids Qur'an
This graphic "description" of the angel's approach, based on an Arabian figure of speech, is meant to convey the idea that the Angel of Revelation became a clearly perceptible, almost tangible, presence.
lit., he was only two bow-draws away.
Two bow-shots (counting 100 to 150 yards to a bow-shot) would be a clearly visible distance.