Terrence smirked. "Actually, I like you," he said. "Honestly, I do. That's why I went to all this trouble to set up a surprise for you."
He was telling the truth, he did like Anthony. Found him fascinating, in fact. He thought he would be rather a lot like Anthony if their positions were reversed, though he somewhat doubted that Anthony would be like him if he were the one in power. Which was unfortunate, because it meant that they might not have interacted if it weren't for their current power balance.
"Now, remember, if you decide you don't like it, all you have to do is ask to be let out," he added, eyes practically twinkling. This was going exactly how he had hoped it would.
Before they got started, he made sure that Anthony's head was held in place, so that he couldn't move it to prevent the water from dripping on him. Then he tapped the container with his wand, and the water began to fall, dripping in an irregular pattern onto Anthony's forehead.
Now all he had to do was sit back and watch it take effect.