"Ready," he says, flexes his hands a couple of times, and starts for the rock.

As tempting as it is to try jumping right in at full speed, swarm right up like a monkey and impress Ren with how good he is at this, he's going to make himself move slow. At least for the first few holds. Falling on his ass isn't going to impress anybody. Test the foothold, test the handhold, and up.

And up, and up; even moving (relatively) slow, he's already passing the last point Ren marked.