Though Neville didn't want Luna involved anymore than he had wanted Seamus, running into her in the corridor certainly seemed like providence. He'd heard a rumor that the Ravenclaw dormitory had a complicated means of entry, maybe something like the Headmaster's office...
"Maybe you can help us, Luna," he said carefully, quietly, eyes darting nervously up and down the corridor. What few students remained on this floor were in the process of going down to the feast. He continued without realizing the depth of melodrama in his voice. He was seventeen, after all.