LOS ANGELES — Zac Gallen pumped both his fists and let out a guttural roar. A third straight curveball caught Freddie Freeman off guard as it looped down the middle for strike three, helping the Diamondbacks ace escape the fifth-inning threat, navigate through the two MVP candidates atop the Dodgers’ vaunted lineup and move the quick-strike, upstart wild-card team one win away from the National League Championship Series.
Again, the…