No they don't. However it is unresistable which is very good. A trick archer with manuevers can offer approx 14% defense from 9% tohit debuff and 5% manuevers...making characters like super reflex at a 31% def average particularly happy.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
cheers 
Do multiple applications of this power stack with itself? ie -15 to hit,-22.5 to hit etc.