Answer:
The words that BEST describe the officer's reaction to seeing the horseman in the sky are wonderment and horror
Step-by-step explanation:
"A Horseman in the Sky" by Ambrose Bierce, is the story of the confrontation of both father and son in the middle of war, being them from opposite sides of the battle, the son has to kill his own father in order to follow his beliefs, is in that moment that the other man think they see a man in the sky, a horseman in the sky.