German Shepherd Attacks Angry Pitbull at Park

Dog attack! A large German Shepherd viciously attacks pitbull/ American Bully while they are playing at the dog park! The pitbull/ American Bully has damage done to his eye during the crazy dog attack! Who's actually at fault in this dog park attack? Is it the pitbull / XL American Bully Owner or the German shepherd? Tell me in the comments if you agree?