Natasha tilted her head as she looked at the man. So this was the man who her brother claimed to have loved? This was his 'master,' the vampire? She decided to keep all comments to herself (and whisper them to Clint later on).
"You're John Mitchell, correct?" she asked. "You invented my partner and I over for tea and to help my brother. I'm Natasha, and this is Clint." She frowned, wondering if he had that expression on his face for another reason. "Is he still locking himself away?"