Lord Lu is a male figure whose health is mentioned by the shadow guard. His condition could last for a while, and searching for Doctor Du now wouldn't have the same immediate effect as bringing him to the Lu family when they were desperate. This implies Lord Lu is a patient requiring medical attention, possibly from the Lu family. Lord Lu is likely a senior member of the Lu family, whose illness has created urgency for finding Doctor Du. The shadow guard's thoughts indicate the Pavilion Master's actions are not solely driven by immediate medical needs.
