CHAN AND ELITE SCHOLAR-OFFICIALS IN SONG DYNASTY CHINA (960–1279) 175 DOUBT AND THE HUATOU 178 DID DAHUI BURN THE BLUE CLIFF RECORD (BIYANLU), AND IF SO, WHY? 181 DAHUI’S MOTIVATION 182 KAN HUATOU AND DAHUI’S CHAN DISCOURSE ABOUT THE MOMENT OF DEATH: CHAN RIVALRY WITH TIANTAI-SPONSORED AND INDEPENDENT LAY PURE LAND PRACTICE 183