Padma's mouth dropped open in horror as Crabbe first thrust Ernie into a desk and then used the Imperius Curse on him. Her attention could hardly be split for the scuffle that was slowly growing around the Slytherin, and she nearly dropped her wand as a tremor passed through her.
Instinctively, she sought Anthony's eye. He could no more change this than she could, but a shared horror could, at least, steady her.