When a 13-year-old Game of Thrones fan, Jack B., wrote to author George R. R. Martin asking for a literary ???gruesome grizzly death,??? the young fantasy buff also included a $260 donation response to Martin???s campaign to help New Mexico???s wolves.But instead of killing off a character based on Jack in the next A Song of Ice and Fire book -- ???There is a limit to how many people even I can kil