Xiaotian just noticed that Liuliu's wrist had been bitten. He had been so focused on Xiaojie earlier, he hadn't noticed. He assumed Liuliu could handle a fight and wouldn't get hurt.
"Who bit you? Does it still hurt? Did you fight back?" Xiaotian reproached himself. If he had been with her, maybe Liuliu wouldn't have been hurt. Now he blamed himself for his own injury, it not only prevented him from defending Xiaojie, but also got Liuliu hurt by the Guo family. Feeling guilty, he gently held Liuliu's wrist, blowing on it to lessen the pain.
All of a sudden, Liuliu felt a tingling sensation. Her hand became numb! Was she really that vulnerable? Was she just too hungry? She shouldn't be numb just because she hadn't eaten meat in thirty years. Ignore it!