Insanity
Kagome knew it was insane to run from a predator, but she couldn't stop her human reflexes of flight or fight. Her heart pounding within her chest, she knew Sesshoumaru was not giving chase. He'd just wanted to be alone. Stupid her for thinking she might have been able to cheer the surly youkai out of whatever funk he'd fallen into.
Stopping before she reached the house, Kagome composed herself so that none would know she'd ever been frightened. It wouldn't do to bring more trouble down upon Sesshoumaru than he'd already been in. Friends didn't do that to friends.