I'm seeing a sneaky subtext here. The valkyries keep dying when their champions lose. In some of the Norse myths the valkyries are crucial to the gods side of Ragnarok, the final battle against the Serpent and the Wolf(or Wolves depending on interpretation), also Loki in many.
What if all of this is a plan Loki made with the head valkyrie to weaken the gods before the real war starts? Wouldn't be too far outside of his profile, would it?