Upon hearing Gwenerys' shrill cry and watching her immediately begin to hastily retreat, Miura's expression instantly changed to one of confusion. Her demeanor had been so haughty and smug when she had taken him by surprise, but at the first few movements of his strategy to close the gap between them, she was quick to flee. Despite what seemed like a startled attempt at easing a clearly undesirable situation during their fight, the youngest triplet was surprisingly quick on her feet, traversing the pillow-ridden floor within seconds with ease. Having unexpected her agility, Miura -- oblivious of the smug grin that had been on her Gwen's face -- suspected that this was an act of desperation.
The several pillows that now flew at him did more than enough to throw off his vision for a few moments, and as soon as the masses of fluff cleared, Gwen was out of sight. However, a few seconds' aura focused into his eyes helped Miura locate the girl, still moving and still grabbing pillows from the ground. As he caught a pillow that flew at his face, his smirk returned; faintly visible, silver light began to emanate around his feet to give him the speed boost he needed to keep up with Gwenerys, and after taking a deep breath, the boy surged forward, dashing after his opponent and weaving around other students partaking in the fun.
I don't know what game she's playing, but fine: let's play.