He corrected several Hufflepuffs on their way of adding the aconite leaves. Then he came to Sylvia Cooks cauldron. The potion was perfect. He felt a small bit of nostalgia at the times he had stopped by Hermione's cauldron when he was her professor and saw her perfect potion. All he had wanted to do then, and all he wanted to do now, was find something to criticize.
He walked to the next student and immediately shot barbs at how she was adding her aconite and the cut of her leeches.
Feeling better, he walked on to the next student.