It's about a confrontation between the Heike and the Genji, one soldier is asked to shoot a fan that the Heike set on a boat far at sea. He knows that he can't fail and won't be able to show his face again if he does. He enters the sea on his horse to get closer then he prays to his gods, the winds and waves calm a bit on the rocky shore so that the fan seems to still, he makes his shot and hits it a little above the center.
