Then Mark Checked The Air Pressure
Leaving Davis near the barn, Mark walked back into the center of High Meadow where the sheep had been circling. Something was bothering him. If there was no predator, no visible threat, and no injury, then the cause had to be something they were missing. He opened his belt pack and pulled out a small handheld barometer, a tool rangers used to monitor pressure changes in the mountain passes.
He turned it on and waited for the display to settle. Instead, the numbers jumped wildly. The pressure was not simply rising or falling. It was spiking up and down every few seconds, even though the air around him seemed strangely calm. Mark stared at the screen as the realization hit him. The sheep were not running from something on the ground. They were reacting to unstable pressure in the air, tiny violent shifts that people could not feel clearly but that could overwhelm the animals’ balance and senses.
