Remembering what she had been asked to do by the Resistance wasn't good for her concentrating. She knew she was distracted. Knew that she was making a fool of herself. Hermione didn't understand why it seemed that Aberforth appeared to take her failures personally, but he did. Perhaps he was the kind of person who didn't like how a student's inability to perform reflected on him as a trainer. It didn't really matter. His frustration grew higher with each subsequent curse she was unable to block.