"Severus is a powerful Legilimens.  He needs neither wand nor verbal spell to use his abilities," he said, when she told him what had happened earlier.  "He was not correcting you... merely reminding you.  If you were being punished by him, you would know.  As you named him, he no longer has to ask permission to rebuke you, nor do Scabior or Yaxley.  Do you understand?"