At this moment, Tang San wasn't thinking about how the power of the Asura God was related to him, or whether killing it would affect his body. All he could think of was that Xiaowu must be safe, even if he had to die himself. He absolutely could not let the energy of the Asura God harm her.
Tang San's reaction was incredibly fast, but everything happened too suddenly. From the moment the power of the Asura God entered Xiaowu's body until Tang San realized what was happening and immediately came to her rescue, although it was only a brief second, for the power of a god, that one second was already enough.