Unusually, Shi is a talking dragon. This has also appeared in old English and ancient Nordic epics, especially fafnir in The Legend of Wolsonger and Song of Nibelungen. But fafnir can speak, because he was once a human being. Even when he became a dragon, he still kept his thoughts and language. In the dialogue between Shi and Bilbo, the language used by Shi is very old.
Shi Mao Ge is very familiar with everything in the treasure, so he can immediately perceive that the Jinbei has been stolen by bilbo baggins. Some people describe Shi's anger as "like a rich man with great wealth suddenly finding a treasure missing, even though it is useless to him". Shi is very familiar with his treasure house, and the theft of the golden cup caused Shi's rage.
A lot of gems and gold stuck in Shi's chest and stomach, which made him almost unhurt, but Bilbo found a gap in Shi's left chest in Shi's nest. Bilbo then told the dwarf about this weakness, and the crossing bird who lived in the secret door of the lonely mountain also heard the news and told Bud in the valley town. Later, Shi attacked the valley town, and Bud shot a black arrow at Shi's left chest, killing Shi.
Even if Bud later used Shi's weakness to kill him, Shi's strength will not change. His death only allowed people to take advantage of his weakness. If he hadn't been caught in his weakness, he must be the strongest in the ring.