The dragon still clearly remembered who Daoyou was because they had a fight a while ago. The dragon immediately attacked Daoyou and now he was venting his anger on Daoyou, of course Daoyou couldn't fight the dragon because he had absolutely no spiritual power while the dragon was from the upper world which of course had very high spiritual power.
Therefore, battle is now unavoidable while Daoyou can only be the dragon's toy. The dragon had completely vented its anger on Daoyou and Daoyou's body was now covered in wounds. In fact, many of his bones were broken because the dragon really felt vengeful and took out all his strength whereas if he didn't bring out all his strength, Daoyou would definitely not be able to fight him.
Moreover, all of this power is taken out and the daoyou is powerless. Now he is unconscious and whatever he feels, he feels that now his life will not be long because Daoyou really has no hope of living anymore.