I think there was a lot more going on in that fight than first meets the eye, so to speak. CJ is the first one we observe trying to kill the zombies by bleeding them out. Scratch tries to kill CJ by bleeding her out. Scratch has CJ's defense broken and I assume some sort of control hold. She does not thrust to the torso, she goes for the femoral artery.

Also, the view of the battle we get is Most likely from Burt and I think he is holding back information. Remember, we are supposed to believe there is a zombie outbreak, Scratch has time to break Latch out if prison on the west coast, cross back to East LA and steal the RPG before Burt gets to his store. Weird.

If Burt is hiding stuff, I do not think he would write Scratch called CJ the queen and Cj called Scratch a hunter.