>>Kimberly was handed the clue, and Rob snatched it out of her hand, as though she wasn't capable of reading it. He did hand it right back to her, but too little, too late... ??<<If this is the Hanoi Hilton clue you're talking about, that wasn't Rob doing the snatching.
Peter grabbed the clue right out of her hand, and he also tried to grab a couple of other clues. He was being his usual assness.
As for Rob...I think we have a chicken/egg situation here. She's awful, and if I had to spend several hours with her, I'd probably be nastier than Rob. OTOH, I'd probably have to smack Rob too.
Who started the nasty-go-round? We'll probably never know.