During the dinner party at George Morris' house, how do different people interact with John Berry?

At George Morris' house during a dinner party, different doctors interact with John Berry. Norton Francis Hammond hopes John is able to solve the big puzzle involving Karen's death. Charlie Frank advises him to stay away from the situation. Fritz Werner offers John valuable information but takes care that others do not hear them talking about this. In a sense, everyone is trying to help in his own way.