A 34-yeаr-оld pаtient with schizоphreniа presents with fever (40°C), severe muscle rigidity, altered mental status, and autоnomic instability. They were started on haloperidol 2 weeks ago. Labs show elevated creatine kinase (CK) at 15,000 U/L and leukocytosis. Neuroleptic Malignant Syndrome (NMS) is suspected. Which of the following is the MOST appropriate initial management step?