"I found it two seconds before you walked in. Sitting right here." The thought of Robert dropping off a monster of a sword like this made Ned chuckle. Robert was always up to something mischievous and that would have been his best guess.
"Robert doesn't use a greatsword. It's been in my family for 400 years. In the dreams. I don't know what they are now. Dreams don't just... make swords real." He puts the sword back down onto the table rather delicately. It may be a sharp and dangerous object but something that was 400 years old should probably not be thrown about carelessly.
If he keeps it, he's accepting something he knows next to nothing about. If he tries to discard it, he's throwing away the possibility of finding out what any of all this really means.
"This thing kills me in the end." He didn't know how he could sound so absolutely sure about it, but he was. He dies and everything just... falls away.
"I don't know what's happening Cat but they're not dreams."