H2H tie breakers wouldn't apply to any tie involving both Arizona & Oregon since they didn't face each other.
A Breakdown of potential 2 loss ties breakers.
Arizona, Oregon, Oregon St & Washington: Arizona & Oregon
Oregon, Oregon St & Washington: Oregon St (1) & Washington (2)
Arizona, Oregon, Oregon St: Oregon St (2)
Arizona, Oregon & Washington: Arizona & Oregon
Arizona, Oregon St & Washington: Arizona (1) & Oregon St (2)