Nervous explanation
Reynolds asked my neighbor what he was doing, which made him visibly nervous. My neighbor stammered and shifted his weight from foot to foot.

It was clear he wasn’t expecting to be caught, and his discomfort was palpable. I could see him gesturing vaguely towards the spot he had been digging, possibly trying to come up with a plausible story.
Whatever it was, it didn’t look convincing to me or, apparently, to Officer Reynolds.