Natsu performing a Guard Crush on another Natsu.
Guard Crush (ガードクラッシュ?), also called Guard Burst in Soulcalibur V, is an element of game mechanics which was first introduced in Soulcalibur V that later appeared in Soulcalibur VI, replacing Soul Crushes from Soulcalibur IV and Soulcalibur: Broken Destiny. It leaves the opponent defenseless to launchers, combos or heavy blows. It is a state that is preceded by a flashing lifebar and is triggered after blocking sufficiently strong attacks for a certain period of time, which lowers the character's Guard Stamina.
Soulcalibur V[]
Its animation, as of TGS2011, is identical to that of the Soul Crush from Soulcalibur IV, but it lasts a little longer.