Mr. Jones is receiving a transfusion of packed red blood cells. He complains of chills and low back pain, has facial flushing, and his vital signs are as follows: Temperature 100.1F, BP 88/42, Pulse 125 beats per minute. These are different from his baseline readings of T-98.8F, BP 128/74, Pulse 84 beats per minute. Mr. Jones is potentially experiencing what type of blood transfusion reaction?