Bella had giggled and pulled him aside later to tell him that it would be beneficial to get used to the pain and try and shake off the effects of Imperio. Barty tests him now. He feels the muffled feeling in his head sweep and try and find an opening. He feels that gentle little persuasion. Then he pushes it away. It’s exhausting, especially since he tries again and again, marvelling at the sight of Harry effortlessly shaking it off.