It was Rose Weasley.
"Are you guys ok?" She asked. Then she spots me and Scorpius. Scorpius quickly moved his hand away. "How did you get in?" Roxanne asked? "It was unlocked." She says. "Charm must have warn off." Roxanne walks over to the door.
"Scorpius? What's going on over here?" Rose asked. "Nothing Rose. I promise. I was just trying to help Lily." Rose looked very disappointed. Then I saw the fire in her eyes. She slapped Scorpius so hard he started bleeding. "I'm sorry. But I can't trust you. It's over." She storms out the door. When she opens it someone was standing in the doorway.
It was Mortem.