ok so the way i read it, i think that it could be used this way:
If you can learn the "true name" of an action, why not learn the true name of your opponents attack?
Granted it would take time to master this particular application of the principle, would it not let you be able to... alter certain parts of their strike. for example, changing the target to one of their own, or just changing the hit to a heal.
Im not sure whether actually changing the target would still fall under this principle or whether that is the jurisdiction of another principle. But as this principle is said to have to powers of mind control at higher levels, i dont see why you shouldn't be able to mess with the opponents targets.
I myself have chosen to follow the principles of imiagination, transposition and entropy. I'm thinking that i could find the true name for the opponents mind, or intelligence, and transpose entropy onto it. I'm not sure if that would work, but, if it did, think of the uses of being able to stop your opponent from thinkning.
Also just one worry. If there are so many different spells that can be made by principles, how is the system going to keep up, i mean if someone invents a new spell and tries to use it, will the game be able to identify what the spell is trying to do and give an accurate effect?