River knew that they had to look quite odd, walking and stumbling around the TARDIS. Mostly because they both had completely differ gaits and strides when it came to walking. The Doctor was brisk where River was smooth and unhurried. It made with a disaster when it came to sharing a body and moving it around. She very nearly walked into a wall at one point.

Well your body couldn't have just got up and walked away without you..... or could it? She was puzzled as to the study being empty. No Doctor body to be found. "Are you sure you didn't wander anywhere else?"