Terry had been in the library when he heard the announcement and had gone straight back to Ravenclaw tower. When he got to the common room he saw most of his house though he noticed the absence of Lisa, Stephen and Mandy. He thought they might have been somewhere farther away from the tower than so he sat on one of the couches that he and Lisa usually sat on and waited.
After about 20 minutes he started to worry. He still had no idea why they were on lockdown and hadn't seen them. He decided to check upstairs.
When he entered the room he saw them right away, sitting around bottles of alcohol and though no one seemed to be drinking them, the prefect in him knew they'd get in trouble just for having them at the school.
"What the hell are you guys doing?" He asked them, a hint of exasperation in his voice. He'd been downstairs worrying and they'd been up here gathering booze.