Ernie was surprised to hear the Floo at this time of night and even more surprised to see Hannah, who he'd just been writing back and forth with on his journal. The slap was the biggest surprise of all and he had no time to react until after it happened.
He gasped and turned his head back to stare at her with wide eyes and a slack jaw. A hand lifted slowly and covered the cheek she'd slapped. He didn't know what to say or even do. He had never seen her like this. They all joked about how scary Hannah's badger was but they knew it was the truth.