France is calling him “the backpack hero”, a young Catholic pilgrim on a walking tour of cathedrals who came face to face with the man who stabbed several children in a park in Annecy. Henri, a 24-year-old management and philosophy student, was near the playground in Le Paquier Park when he saw the man attacking children in a stroller as their mother desperately tried to shield them on Thursday. Video footage shows him trying to block the assailant with one of his two backpacks, pursuing the man into the playground, and throwing one of his bags at the attacker. So...