Dinah catches sight of him, and grins. She could sprint the rest of the beams, but they zigzag back around and the end is right ahead of her, so she leaps from one straight to the next and uses that momentum to launch herself down, over the final largest pedestal and into the door marking the end. Hitting at high speed, she tucks her head and rolls, and is well clear of the end before she thinks to turn around and look for her companion.