Watching the video, it appeared the subject with the orange shirt (ORANGE) had already sustained some type of fatal strike to his head or neck area. The crowd watching is mentioning that the man (ORANGE) is "already dead" due to his "head".
After the other individual in the blue shirt (BLUE) throws possible a blade, BLUE appears to advance with a roof block. Deflecting ORANGE's lead blade, BLUE unfortunately takes a slash to his left leg by ORANGE, dropping BLUE to one knee.
BLUE gets back up to his feet and appears to thrust the blade in his hand at ORANGE's neck, causing him to bleed more profusely.
As ORANGE continues to bleed out and advance towards BLUE, his movements appear to slow down. Even standing motionless for several seconds in the middle of the street with both blades touching the ground. The crowd continues saying "already dead."