This brief sequence was to show a possibility of action for the annunciation.
Luk 1:28 And having come in, the angel said to her, "Rejoice, highly favored one, the Lord is with you; blessed are you among women!"
Luk 1:29 But when she saw him, she was troubled at his saying, and considered what manner of greeting this was.
Then the angel said to her, "Do not be afraid, Mary, for you have found favor with God.
And behold, you will conceive in your womb and bring forth a Son, and shall call His name JESUS.
He will be great, and will be called the Son of the Highest; and the Lord God will give Him the throne of His father David."