You shine your weakening flashlight on the rocks. The more you look, the more different from earlier they appear. It's peculiar, but it could be just the light. You're about to move on when you see movement from the corner of your eye. A stocky figure is walking towards you, mostly obscured by the gloom. You slide out your police baton just in case.
Do you:
Call out a greeting? or
Take a swing a the figure?