Leap (とびこむ, Tobikomu?) is a recurring ability in the series. It has no recurring effect however.
Leap is a special command, available to only when Gau is on the Veldt. Gau can learn new Rages on the Veldt. Once an enemy formation is encountered (it does not have to be defeated), it will show up on the Veldt. Once Gau encounters a monster which the player wants to learn a Rage for, Leap must be used. Using the Leap command will cause Gau to leave the party and the battle will end.
Gau also cannot leap if he's the only member in the party or if all other characters are considered dead (KO, Petrify, and/or Zombie). Gau holds the sixth slot in a monster formation. There are quite a few monster formations that uses this sixth slot, effectively preventing Gau from reappearing before the party. If these conditions are met, Gau has a 5/8 percent chance of appearing when the monster has been defeated.
When Gau leaps, he will obtain all the Rages he didn't know yet from that particular monster formation. But if the player killed one already, Gau will learn that Rage. If Gau has been harmed by the party, Gau will run away from them and he will not learn the Rages of this monster formations that Gau reappeared in (current battle). Gau will only reappear if there are three or less members in the party. He will not appear if the battle was a back attack, side attack, or pincer attack. He will also escape if he has taken any damage from an attacking party member while he's standing before the party.
Also of note, all monsters, regardless of being a boss or even the final boss himself are all leapable if they were to appear on the Veldt. Unfortunately, they do not have any Rage abilities so Gau will return without learning their Rage since they do not have any to begin with.
Leap is a Green Magick ability to the Green Mage class. It increases the target's Move and Jump capabilities by 1. It can be learned for 400 AP from the Mandragora weapon and costs 18 MP to cast. It has a range of 4 tiles.