Fire Release: Exploding Flame Formation

The user places their hand on the ground and releases a large number of exploding tags, which stream to the target and wrap around their legs. Once in place, the tags explode, heavily damaging the target's legs.

Trivia
In the anime, Hanzō uses this technique in his battle against the Sannin. In it, he uses a sequence of four hand seals. In Nagato's flashback, he just slams his palm on the ground.