Well after injuring his wrist, Fernando Tatis Jr. was swinging an axe and a weighted bat and progressing extremely well on his primary goal of strengthening his shoulder, according to his accounts and those of others familiar with his offseason regimen. It wasn’t until the Padres shortstop stepped up the intensity of his swings during batting practice that he felt a more severe pain in his left wrist about two weeks ago. This is consistent with how his type of injury often manifests. “It’s common to have a scaphoid fracture and not know it,” said Dr. David Hay, an orthopedic hand and wrist sur…