He tugged gently at the lead rope and walked Shiloh ahead at a pace which did not urge Shadow to any great effort.
He yanked the rope and ran Shiloh straight into a wall. 
mnli hypothesis: He yanked the rope and ran Shiloh straight into a wall.  premise: He tugged gently at the lead rope and walked Shiloh ahead at a pace which did not urge Shadow to any great effort.