Tonks' eyes widened, and she looked with sympathy at the dancers. To her, being trapped like that would be unbearable. "Oh, I hope not... how awful if that was true." She kept looking at them for awhile longer, and then shook her head. "I can't just leave them there if they're under the Imperius..."
She took out her wand and pointed it straight at one of the dancers. If anyone was being forced to dance, she had the inclincation to stop it. "Finite Incantatem!" The spell worked, insofar as she felt it leave her wand. However, there was absolutely no effect. The dancers kept dancing, and didn't so much as look at her.
"Oh well." She sighed softly and tucked her wand back away. "I would like to look around more, but I think I'll go to my room first. Do you think we could meet again?"