《搜神后记·卷八》
诸葛长民叫人拿刀悬在半空去砍，那些蛇头看到刀砍来就隐藏不见了，等拿刀的人离开后又重新出现。
令人以刃悬斫，应刃隐藏。去辄复出。
Zhuge Changmin asked someone to hang a knife in the air to cut them, but the snake heads hid when they saw the knife coming. They reappeared after the people who held the knives left.