Real-time feedback is increasingly valued in sports training, yet in curling it is commonly delivered through off-stone displays or post hoc review, forcing disruptive gaze shifts while athletes track a moving and continuously rotating stone, especially during collaborative sweeping. To address this gap, we present TabletStone, a stone-mounted tablet interface that provides in situ, glanceable feedback with role-aware layouts and rotation-robust visualization. TabletStone is implemented as a lig