Nothing calls or jumps here (searched), and the build's sessions never ran it; stage 1 took it for data. It is code, and ends where SCENE_TOOL begins: it sets bit 1 of the graphic and the mirror flag, the two bits a clockwork mouse (CLOCKWORK_MOUSE) faces by, from the signs of the steps in U (+9) and V (+A). The signs agree with the mice's way of facing, but the axis does not: as written it faces along V when the step in U is the larger, and along U otherwise -- across the larger step rather than along it -- so it was either for sprites that face another way or left unfinished.