Seventeen-year-old Lily Evans ducked, a beam of green light whizzing overhead and leaving burn marks on the stone wall behind her. Windell was dead, Lucius had broken off from the plan, and Molly was caught up in a different part of the castle. Nothing was going the way they had anticipated, and it was all because of her.
A dark cackling resounded through the hallway where Lily waited, and Bellatrix Lestrange stepped over a fallen stone pillar, wand at her side.
"I should've killed you sixteen years ago, when I had the chance," Lestrange hissed. A punched-out hole in the ceiling let in cold moonlight, illuminating the ghastly smile she wore as she lifted the wand up to Lily's face. The madwoman's eyes took in the young girl's expression of terror, and the scar that adorned her forehead. Lily gripped her wand nervously, waiting for any moment to escape.
That moment arrived just in time, as the blurred form of someone on a broomstick body-slammed Bellatrix from the side, knocking the wand from her hand and sending her to the ground with a shriek. Lily backed away, looking at the wall. This is where Dumbledore had said the Room of Requirement was here, and it would show up when she needed it.
Molly walked up next to her, broom in one hand, keeping an eye on the motionless form of Bellatrix on the ground. "Any luck, Lily?"
"Not yet," Lily responded, thinking hard, eyes closed. I need a place to keep my friends and I safe from the Scratch. I need a place to keep my friends and I safe from Oblivion.
Next to her, she heard Molly gasp, and looked up at the wall again.