Email Chain

Warning This Section Does Contain Spoilers

This is an email chain between the victim, Charlie, and Susan Li. Susan is irate because Charlie has, once again, made a mistake on a prescription for her veterinarian clinic. Charlie has apparently written more than one prescription that was incorrect for her patients that could have resulted in fatal consequences for the patient. She tells Charlie that "she knows what he does" and the rest of the community would be better off without it. What could she mean?