Descent of the Gargoyles

The skittering outside her window warned her. She hesitated, and then threw open the shutters. A gargoyle's stone head swung to look at her, and then he continued climbing down the castle wall. She stared. He sank into the moat and, in time, crawled out the other side and disappeared into the forest. More skittering. She leaned back and stuck her head out--and gasped. All the castle gargoyles were leaving, climbing down the stone ramparts they'd guarded for so long and crawling back into the forest, heading for the stone caves they'd come from. Thunder cracked in the distance. She pulled on her dressing gown, seized the lamp, and ran to tell--

Inspiration: Skittering things outside my window when a storm was coming.
Story Potential: Medium.
Notes: It's not really a concrete story idea at all, but it's a ferociously bad omen! Not sure if it's a physical storm they're fleeing. Also, smells like a novel.