There's kind of a secret, but you can find it in the secret techniques list. Still, you'd have to read through a lot so I'll just mention it here. In the Abilities chart there's an option to invest in a function of holding down the circle button in order to inflict various states of shock in enemies, depending on how long you hold it. You have to unlock them though through leveling up. You can send a giant enemy into Tremor Shock instead of Kneel Chance. After doing this (holding circle until Kenshiro flashes bright the maximum number of times, I think 3 or 4) press circle and it'll be a Secret Technique exclusive to putting gigantic enemies in Tremor state this way. You can't do it any other way. Again though, you have to level up and purchase this ability in the Abilities chart. Still, it's an explosive Secret Technique that's worth seeing. Fun game, eh?