The refusal of the pup to come into your space with the dummy and dropping the ball short indicate that his mindset is changing when nearing contact with you , it's a zone the pup is uncomfortable with , it's going from drive to fear,a dog can only reference one feeling at a time,
Dogs switch polarities to fit with us and other dogs it's how the pack works , every dog makes itself social to fit it's how Mother Nature evolved to accommodate large groups of predators in the wild , meaning they can't all act predator like or dominant some must act submissive or prey like, what's happening with