That's just upsetting. She gives up trying to find Bella, that's pointless, she could be anywhere. Back to trying to attack Darren.
They probably don't notice right now because they are busy, but there is a car approaching.
Bella trails not-Savannah, using her wake, gliding rather than making flapping noises, so she can pounce if she catches up to Darren. She's gone fullform since she's conveniently invisible.
Dance away, dance dance - whoo that was a close call he almost got punched - dance dance.
Bella doesn't want to blow her invisibility when presumably Mrs. Adams can identify the demon's host and even tell where Bella is if she has to. So she doesn't say anything.
Bella, reasonably confident that Mrs. Adams knows what she's doing, alights next to Darren, close enough for him to hear her breathing.
"What," laughs not-Savannah. "Going to set me back to Dis? Good fucking luck managing that without killing the girl."
Darren makes a little sound in his throat. "What, no, Mrs. Adams - my sister-"
Another stare. "D-Don't, no, don't."
And if she's not, maybe fairy princess magic can heal even after the point where someone's technically dead enough to evict occupants.
Bella presses herself against Darren, hopefully comfortingly.
He doesn't know what he would do if she died here.
The demon phases out of Savannah. The teenager slumps back, unconscious, but alive.
Who's up for round two?
Mrs. Adams. Mrs. Adams is up for round two. She demonstrates by picking up the demon with sharp, sharp claws, and throwing him - it? - at a tree. She does not pull her punches, not when demons are involved.
Bella lopes up to Savannah, goes human-form enough to get at the scrolls on her person, pulls a healing one, recites its incantation from memory.
Darren notices Bella's attentions towards Savannah (by sound, not by sight) and smiles a little. He is perfectly happy to go help with taking out the demon that possessed his sister, now that it is firmly out of her...
The demon might, though. It becomes readily apparent that demons don't bleed. Instead, they ooze a red light that sticks to things before fading away. Some of the gore without none of the mess, how convenient. Because trying to clean up after the English teacher's demon-centered rampage would take hours.
It is not a clean fight. But it is very very fast. Also very one sided. The scattered pieces that remain of the demon fade away after, leaving nothing but the teenagers and the bugbear.
Bella goes back to invisibly leaning on Darren. She doesn't return to fullform; the invisibility will wear off any minute now.
Darren would try to take her hand, but - invisibility. "Thanks," he murmurs to her, instead. He checks over his sister with worry, occasionally giving Mrs. Adams nervous looks.