Haven’t played Blue Archive, but doesn’t their halo go away when they are unconscious? So she is fainting?

Varum said:

Haven’t played Blue Archive, but doesn’t their halo go away when they are unconscious? So she is fainting?

I think it's supposed to represent being fucked silly, or something of those lines.

Varum said:

Haven’t played Blue Archive, but doesn’t their halo go away when they are unconscious? So she is fainting?

Tldr, she was reaching her climax and her consciousness is blurring, thus lead to flickering halo.