A touch that lands in the right third of the screen on no control holds the right stick, centred where it lands; past the stick radius the centre is dragged along, so turning back responds at once. Controls in that third (A/B/X/Y, ZR, R, R3) keep their touches; in Super Mario Galaxy the pointer keeps the other unclaimed touches. Only the left stick is drawn now, so a right-stick swipe redraws nothing.