Ron responded the only way he knew how: by getting defensive. "Hermione, Penny was in trouble - or at least I thought she was in trouble - I couldn't wait for backup to arrive! The witch would have killed her and left already and we wouldn't have any of the new information we have now! Besides, she didn't kill me, alright! I'm right here!"
Ron shook his head. "No, she wasn't Pandora, but that doesn't mean she wasn't under Imperius or possessed. Something wasn't right with her, Hermione. She was much too powerful. I was able to hit her wand hand with an Impediment jinx so I thought I'd gained the upper hand, yeah? But then she raises her other hand and performs wandless magic. This is no ordinary witch."
He wanted to continue on, but he didn't want to give her too much information all at once. He needed her to comment on each bit as he went, because he needed her opinion to add to his own thoughts on what he'd seen.