A police officer escorts in a young man in handcuffs who will later "swear to gawd" that he wouldn't have run if he'd known it was a policeman... or, anyway, if he'd known the officer had a dog. I guess they guy's hindsight is better than his foresight, especially when he a ragged wound in his forearm to remind him. Maybe that's not hindsight so much as houndsight?
But really, how was he supposed to know the guy was a police officer? As he noted, "It could have been anyone" shining a flashlight in his face. And saying "Stop! Police!"