There was the woman herself. Harry didn't blame Ron for looking like he did. He didn't know what to do when she breezed past him and then the deluge of words started. From experience he knew it was better to just duck and cover when she and Ron got into it, but he didn't think Ron was able to defend himself as vigorously as he would have usually.
"Calm down, Hermione," Harry said, hoping he wasn't going to get hit for his trouble. "Everything is fine."