Mac nodded shortly as he stepped over to the stall that held his favorite mare and rubbed her neck gently.

Mac nodded as Keiley glanced over at him.

Mac nodded toward a clearing he had illuminated with a spotlight.

Mac nodded for David to follow him to his office, across the hall from Annie's.

Mac nodded, and immediately produced a glass vial from the evidence processing kit.

Mac nodded, giving her a look that was hard to read.

Mac nodded slightly but gave no other sign of having noticed Murdock.

Mac nodded, but as they headed for their own quarters, a uniformed orderly approached.

Mac put a finger to his lips and nodded.

Mac was nodding now, picking up the train of thought.