break missing at graph_select_segment?

It really does not make sense to me that a break is not present before case ELMT_ARC: static void graph_select_segment (struct graph g, int x, int y) { struct element_list list; struct element *e; guint num = 0;

debug(DBS_FENTRY) puts ("graph_select_segment()");
x -= g->geom.x;
y = g->geom.height-1 - (y - g->geom.y);
set_busy_cursor (g->drawing_area->window);
for (list=g->elists; list; list=list->next)
for (e=list->elements; e->type != ELMT_NONE; e++) {
switch (e->type) {
case ELMT_RECT:
break;
case ELMT_LINE:
if (line_detect_collision (e, x, y)) {
num = e->parent->num;
}
case ELMT_ARC:
if (arc_detect_collision (e, x, y)) {
num = e->parent->num;
}
break;
default:
break;
}
}
if (num) {
cf_goto_frame(&cfile, num);
}
unset_busy_cursor (g->drawing_area->window);

}