If Daphne could still enter Earth, she may have explained to the humans that these red lights are genuine Auster people's defensive fortifications, their offensive power naturally can't be fended off by the people of Earth!
However, she can't possibly enter Earth now. Even if she slays the representative of the Auster people, she still can't enter Earth because the attack power of the Metal Monsters has taken form; even the flying stick she's piloting can't get in!
The situation has formed a bizarre balance!
Daphne's so-called 'Empire' force has completely perished on Earth, and she can't enter the Earth.
As for the 'Auster Civilization' where the Metal Monsters reside, it appears to be unable to make deliberate judgments autonomously since every representative of their civilization was killed by Daphne, they could only repeat pointless attacks and simple self-preservation efforts!