Sunny hadn't really been thinking of what the streak of shimmering movement out of the corner of her eye had been, but her brain pretty much automatically supplied, Winter. It had been going too fast for her to follow where it had gone, but she turned away from her path to check.

Because quite simply, if she saw what she thought she'd seen, something had gone awfully pear-shaped.

After a while, though, she started to wonder if maybe it had just been a figment of her imagination. "Winter?" she called experimentally.