Prompt: chance
Tonks paced along the garden path, tapping her wand against her leg. Inside, the Weasleys were hosting an informal dinner to celebrate Remus's return. It was dark enough outside that nobody would know she'd lingered for almost an hour, trying to summon the courage to enter the house. If asked, she could claim she couldn't get out of work. No one would question that, especially now.
She spied a small beetle scurrying across the path. If it reached the other side before she got to it, she'd leave.
Halfway across, the beetle turned and went back the way it came.