[Sherlock doesn't hear Joan the first time she calls his name. On the second time, he does look over at her. Confusion slowly fades to something more understanding.]

Oh, right.

[He glances over the edge and takes a moment to calculate his fall from a misstep.]

I wouldn't say pavement, though. Based on my average velocity and barring catching myself before falling, I would most likely land on the edge of the pool, severing my spine. Less messy, still an undesirable result.

[He gestures Joan to climb down first.]