He whistles sharply to bring the arrow in closer, zipping through and hitting the ki lights before they can get threateningly close. His mouth is busy dispatching orders to his arrow, the pitch of his whistle dictating the speed, the fin dictating the motion and destination. So he just gestures to Vegeta he wants more, and faster.

It is helping. He doesn't want to think right now, and he's become pretty damn focussed.