Yuki froze when he heard someone talking.  Upon being given an order, he instead drew a kunai.<br/><br/>Untying would take too long, especially in a pinch where his fingers were a little shaky.  He went for the two top knots first, hoping to disassemble it quickly so Maki could just 'step out'.<br/><br/>If that didn't work, he'd go low and cut the bottom knot, too.  He didn't even bother to think about whether Maki would very much appreciate his use of a kunai in these circumstances, but she'd be out of the ropes and quickly.  A crisis would be averted!