The western overlord, the Storm Vulture, is having an easier time in battling Hati. The lesser fenrir could not deal with her attacks that rage like the storm and as fast as sonic booms. The deadliest part about her is the talons that carry the lightning element itself.
Vayu that has been supporting her is very beneficial to her as they could synchronize their strengths. Vayu would produce the great winds like tornadoes and wind blades while the Storm Vulture would use those to entrap Hati.
Hati did not let itself get bullied one-sidedly though as it would counterattack whenever the Storm Vulture or Vayu would get close to it. The long-range attacks that Vayu and the Storm Vulture are doing is not always accurately hitting Hati because of its unique passive skill.
Creation is hard, cheer me up!