Without waiting, using your own calculations:
Turn 1: Archangel hits for 77hp, Ancient Behemoth responds with 83 (status: Archi 167 health, Ancient Behemoth 223). Ancient Behemoth hits for 83 health, archangel responds with 77 (status: Archi 84 health, Ancient Behemoth 146)
Turn 2: Archangel hits for 77hp, Ancient Behemoth responds with 83 (status: Archi 1 health, Ancient Behemoth 69). Ancient Behemoth hits for 83 and kills the archangel.
What do you think of this version?