The Doctor finds himself grinning like a maniac as Thirteen prepares for her jump. Why he's so amped up to watch her dive is something of a mystery, but he doesn't dwell on it for the moment.

He watches on the viewer as she takes her jump. She leaves the cliff at a good run, but almost instantly after she leaves the ground, the low-gee field generated by the lake catches her. She seems to hang in the air for a few seconds before starting her descent. He quickly calculates that she's only accelerating at about a third of Barcelona's normal gravity, which is only slightly less strong than Earth's to begin with. In other words, it'll be a nice, leisurely drop to the water below.