Dumbledore could think of many more words with far more negative connotations. But as headmaster it is not for him to share them with a student.

"I see."

For the smaller things, it's often found to be beneficial to let the students, led by the prefects and head boy and girl. But it might be time to take a slightly harder line on things like dungbombs. At least for a while.

"Thank you, Miss Evans. I think that will be all for now."

"Though, tell me," he adds. "How is Miss Macdonald faring?"