Tasara doesn't know what the Domain was thinking, sending this girl here. Either they're more desperate than she thought, or this girl is extremely foolhardy. Likely the latter. She's, hm, maybe three years out of training, judging by her stamina. Not much finesse, but exuberance in abundance, and a stubborn refusal to admit she's outmatched. If they were further from the city Tasara would flatten her, but the goal is defense, not destruction.
"Can you trace them?"
"The seals? Yes, but it'll be slow, my eyes aren't optimized for that."
(It's definitely reacting to plan smash, but trying to go around reveals more of the field.)
"Don't bother, then. Just keep watch." Tasara adds her capabilities to the smashing.
She does so - deflecting a few more genjutsu in the process, there's traps here but that doesn't explain all of them -
And the barrier eventually shatters, reflecting their energy back at them.
"-Whoops." This is startling but not overly inconvenient.
Tasara throws up a shield in time to prevent any blowback from reaching their backup.
And then they're moving forward again.
There's something dark, black on black in the shadows, bubbling up and reaching lightning fast for Anneia -
She blasts it with a burning beam of light.
It - sort of flows out of the way.
It's below her now, too, quiet and almost invisible and fast, and behind her, and above.
aaaAAAA bubble time okay now there's a bubble of the light around her.
Itachi and Kakashi have been forced to retreat back, and aren't having nearly as much luck avoiding it -
Make that none. The shadow pours itself into Itachi's skin, bubbling up through her mouth, and her red eyes try to meet one of the magical girls' gazes -
Tasara thrusts out a hand and a blindfold snaps around Itachi's head.
The bubble around Anneia brightens, expands, touches the tunnel wall-
and flares out along it, rushing ahead and behind, coating the ceiling and floor, bathing the area in brilliant light.
Tasara reaches and and pulls Kakashi back to float next to her.
It turns out she can still scream.
And she's not as good yet at genjutsu that doesn't require the sharingan, but if they can see her she can trap them, enough to beat even Kakashi, and if they can't she can't get past Kakashi but might be able to disorient them -
(She hates this, is screaming in her head and out loud, but her chakra isn't hers anymore, her body's this monster's - )
It's very bright in the tunnel now.
This should not be happening to Itachi. She's too young for this. But is happening and there's nothing she can do about except try to make it less bad. Operating under the assumption that the bubbling shadow she saw is acting more like a poison or an infection than a mental attack, she spins off a gobbet of energy that forces itself down Itachi's throat to purify her of foreign substance.
It's winding its way pretty tightly into her chakra, and it can be purged but with difficulty -
It tries to make Itachi wrap both magical girls in an illusion that'll make it look like they're attacking each other -
It's pushed back enough Itachi can think a resounding no.
And then it flees, and she collapses, gasping.
Anneia winds back her distributed flare, and goes to help Itachi.
But Tasara holds out an arm to stop her from approaching.
" - I think I'm me."
"What's the last thing you remember?"
"I don't have any memory gaps. You pushed a ball of energy into me, and it drove the foreign chakra out."
"All right." She pulls her arm back.
Anneia moves forward to heal Itachi's burns. "Sorry about the, uh, stuff."
"It's - alright. I apologize for getting caught."