what is samneric fear about the savages warpain?

The war paint gives Jack and the hunters a new identity and allows them to do things they wouldn't ordinarily do. Samneric are right to be fearful. The book uses the phrase "liberation into savagery" to indicate that Jack and the hunters will not be deterred by the limits of civilized behavior. Jack and the hunters have become "free" to commit acts associated with savages when they apply the warpaint.