Brayden was shocked to hear that Clinton knew that Meredith called him the elevator god. He wanted to know how Clinton had come to that knowledge. He wanted to know what else Clinton knew.
Meanwhile Meredith had pulled away from Brayden and was snapping up her coat. Brayden looked at Meredith who was to the side of him and possibly only in reach because of how small the elevator was.
Then he looked back at Clinton, who was facing forward. Brayden stared at Clinton's back, trying to think hard if Meredith ever mentioned it at any family function. The only time that he could think of was the family dinner she went to.
Brayden had been talking to his father and Edward was giving her a tour. It was possible that she could have mentioned it then. Brayden was out of ear shot but he had seen Edward take Meredith upstairs on a supposed tour of their family home.