[quote=KatherinWinter]
Im not sure I understand. She can only to a person power and then never again? How long does the power blocker last?
[/quote]

A minute, if that. Afterwards, the enemy is free to do as they wish with their power until she regenerates (a good thirty minutes, though if need be it can be shortened/made longer). It can be used unlimited times on any given person, multiple times in a row, but using it on new people will prove to be more exhausting than on someone she knows.