They were all back in the Room of Requirement, where they were learning how to shield themselves. Remus and Lily had explained how important it was to be able to shield themselves in times of danger, so they had been doing the spell for the last 2 hours.

Whilst everyone was practicing, Lily and Remus were talking against a wall.
“What are we going to do when we all graduate?” Remus asked.
“I don’t know Remus. Hopefully we can go to each other’s houses and practice as a group each week still,” Lily replied.
“Yeah, that’s what I’ve been thinking about. I think it would be best if we continued with it, rather than just stop,” he replied. They both stood there for a while, talking about plans. Across the room, James and Sirius were screaming, trying to get their attention. They found a good way, and everyone’s hearts jarred in their chest as Sirius’ voice was amplified around the room.
“PROFESSOR DUMBLEDORE IS COMING!” he said.

“Quietus,” Lily said, pointing her wand at him. She shot him a bad look, and they all stared at the door. Were they all busted?