[Ballbarian]

(Hopefully I won't add to the confusion,) but frighten will lower the morale of the units hit and then other events (such as dying comrades) will cause a morale check and you get your payoff. And in the case of false horrors against elephants, making them skittish is good, but you need to be able to hurt them some as well to push them over the brink and into full rout.