Because he's too proud to succumb to the urge to sit and rest, not while there's fighting to be done - the ankle shackles are spun around once, twice, on his fingers, before he throws them at the curved surface of the dome. It hits the wall and makes it bulge outwards, with a noise much like a bell being struck, but it doesn't break through.

Instead, it comes shooting back at Hibari - but he catches the shackles easily, as if he's used to toying with such things.

"What a pity," he murmurs, fiddling around with them. It reminds him of his Cambio Forma, before Sawada forced them to destroy the Vongola Rings...