Arthur looked at the boy. Why does he not speak? Well... his loss, he thought. ''There are three of them, professor. First, the Imperius curse which enables someone to control the mind of another person, which, according to the book, has to be weak minded. Although, that is a mistake, because a skilled wizard can control the mind of any other, unless they are peers. The person does not necessarily have to be weak minded.'', he said. ''The second is the Cruciatus curse which is characterized by a red light that is fired from the wand. It is the pain cure and causes extreme pain through the complete body. It is connected with emotions. The stronger the emotion is, the stronger the pain.'', he continued. ''And finally, the Killing curse or Avada Kedavra, characterized by a green blaze. It is the most dangerous of the three and its the only one instantly fatal. Why? Simple, because it kills the victim instantly, in a matter of moments, but it is painless.'', he finally finished.
He then turned to Mariana. ''Well, I have had the pleasure of dealing with them and they are fun. And no, she will not use them on us'', he whispered to her so only she can hear him.