After you've done the "sqare, x, triangel, sqare, o"-combo you press triangel+ sqare+down and Jin goes in to Mental Alertness (2) with glowing hands. You can also do it after a hit with Left Roundhouse (right+x).
Jin Kazama is a man in a game called Tekken that hates his dad and grandfather so much that he changed his surname to Kazama from Mishima, the surname of his mum Jun. Jin's surname was never Mishima...
Technically, he died in Tekken 3 when he defeated Ogre and Heihachi shot him. He was brought back to life by the Devil Gene, and is still alive at the moment.