In aSoS, Catelyn VII, Catelyn begs Walder Frey to let her injured son go and keep her and Edmure as hostages in his stead. Robb refuses:
"No." Robb's voice was whisper faint. "Mother, no..."
"Yes. Robb, get up. Get up and walk out, please, please. Save yourself... if not for me, for Jeyne."
"Jeyne?" Robb grabbed the edge of the table and forced himself to stand. "Mother," he said, "Grey Wind..."
"Go to him. Now. Robb, walk out of here."
Of course, Lord Walder won't let him do that and we all know what happens, but I find Robb's last words curious. Why did he think of Grey Wind when she mentioned Jeyne? I don't see the connection there. And what did he want to say about Grey Wind?