Tora Hishigi

Tora Hishigi is a hand sign taught to Shinra by Captain Benimaru.

Overview
Shinra uses this hand sign to direct focus and power to his feet; this allows Shinra to use Rapid, which increases the thrust of his flames and compresses them into a single jet, as opposed to how his flames normally spread out in every useless direction, giving him an exponential boost in speed and power.

The hand sign is made by placing thumb across the palm of the hand and then touching the base of the thumb with the index finger.