The upcoming Game of Thrones book Fire Cannot Kill a Dragon by James Hibberd details how the acclaimed actress, who died last week at age 82, could be fierce backstage. "I was terrified of Diana Rigg," says Emmy-nominated director Mark Mylod. Natalie Dormer, who played Olenna's ambitious granddaughter Margaery Tyrell, adds: "When you have someone who has that many accolades, you just shut up and watch. She had a very dry sense of humor and was aware of the parody of herself. Sometimes I think she was mischievous to see what she could get away with."