Chasidut zu Bereschit 16:8

‎Genesis 16,8 or Genesis 16,11., “The angel of G’d said to her (Hagar) etc.” It is ‎somewhat surprising that whereas Manoach upon realizing that ‎he had seen an angel was afraid that he would die forthwith, ‎‎(Judges 14,22) Hagar did not react with fear at all. The reason may ‎be that the angel which appeared to Hagar had appeared as an ‎angel in the garb people expected angels to appear in. The angel ‎that had appeared to Manoach and his wife had assumed human ‎form, though he had looked awe-inspiring, so that Manoach and ‎his wife had assumed that he was merely a prophet. When upon ‎his departure to the celestial regions in the smoke rising from ‎Manoach’s offering, it turned out that they had seen a heavenly ‎being, Manoach reacted with fright, and his wife had to calm him ‎by showing that his fear was quite unreasonable. (Verse 20-23 ‎there).‎