Records of the Three Kingdoms
Pang De, courtesy name Lingming, was from Huandao in Nan’an. He fought under Ma Teng and Ma Chao and was known in the army for courage. After the defeat at Tong Pass in 211 he passed to Zhang Lu and then, with Zhang Lu, submitted to Cao Cao. His elder kinsman was in Shu, and some in Wei doubted him. He spoke of dying for the state to make his own position plain.
In 219 he and Yu Jin went to relieve Cao Ren at Fan. Guan Yu attacked, and after days of rain the Han River rose and drowned Yu Jin’s seven armies. Pang De fought from a small boat. The boat turned over. He clung to the hull, fell into the water, and was taken alive. Guan Yu offered him service and mentioned his old master in Hanzhong. Pang De would not kneel. He cursed Guan Yu and was killed. Yu Jin surrendered. Chen Shou sets the two endings against each other.
Romance of the Three Kingdoms
The novel sends Pang De to war with a coffin, to show he does not mean to return. The flood of the seven armies is still the center. His arrow, striking Guan Yu’s helmet or arm, gives the book the wound that the bone-scraping scene will treat.
Captured, he dies cursing. Yu Jin kneels and asks to live. The pair is there to spell loyalty. The coffin and the arrow wound are the novel’s additions.
Reference: Wikipedia · Pang De