He watches openly, noting the fluid way she moves, the way she doesn't need to look down to be perfectly assured even though a fall from this height could hurt badly.

It's both familiar, and not, from watching his fellow students at the Guild. Moving in shadow, they are always holding themselves tense and alert for danger or competition so that sometimes, against all logic, they are more obvious. It would be very easy, he thinks, for the eye to slide past River if she wanted it to.