Mable stayed standing while Edward sat, but she did not look uncomfortable in the decrepit space.  Mostly, she seemed to be looking for another seat or a place where the dirt was not so loose that it would get on her dress.

"No, it's nice here.  Let's stay for a little.  May I see your knife?  You have me curious about it!"  She's seen knives before, but she couldn't imagine why Edward needed one.

Well, she could now that she was staring at his discolored eye again.  Worry flooded her anew, but she pushed it down.