A devious grin would spread across Toshi's face. He'd wait for her to get somewhere around a mile away. He'd then crouch down into a 'runner's start' position. He'd allow his chakra to pool into his feet and especially his ankles. He'd then grip the ground tightly, a quick couple drops of his chakra pooling at the tops of his fingers. He'd then pull on the ground with his arms, straightening his legs as much as possible. In the same moment, the chakra in his fingers would explode just outside, giving him easily three times as much force. As he began to launch, he'd push on the ground with a bit of strength, pulverizing the ground with a larger explosion to propel him forward. The resulting speed from all of this would send him flying through the forest, catching up to Mei within moments and passing her. He'd then keep traveling at her pace, waiting for her to catch up. Truth was, Toshi only did that because she was there. He wanted to show just how much more powerful each individual ninja from the Hidden Sand was, and that he was definitely in command on this mission. That, and he couldn't help but show off for a female, regardless of whether romanticism was involved or not, it was just something he did.