Rosy beams and kisses him on the cheek.
As rehearsed, she walks around the edge of the circle, and when she's standing by her sub-circle she closes her eyes and cups her hands and summons her light. It shines between her fingers for a moment before she opens them, and seven big bright shards of colour break away from the central mass: red, orange, yellow, green, cyan, blue, and purple, with white left lonely in the middle. The colours drift through the air to land on the seven crystal spars arranged around the perimeter of the circle, and the white fragment follows, finding its place atop a larger central crystal.
It's not clear whether the crystals are absorbing and perpetuating the coloured lights, or whether Rosy is maintaining her concentration to keep them there; she doesn't have that look of intense focus she was wearing last time John saw her make light, but then, last time John saw her make light she was haloed in a swarm of hues, and this time it's just eight pieces, probably less than a tenth of what she was manipulating before. If the cognitive burden scales with the number of shards, she could probably do this much in her sleep.
She takes a deep breath, and catches his eye, and smiles, and steps into her place.