Video ends before conclusion. A gun fight can become a ground fight and vice versa.
Aside from maintaining enough distance to not get hit, closing the distance against a blunt weapon is the best option. Moving into a clinch removes most of the advantages for the weapon.
Conversely, stepping away keeps you at the effective range which is very bad. The victim here was slow to respond and took a lot of damage, but ended up in a better position toward the end of the video where it ends without a satisfying conclusion. The aggressor even threw away the stick when he realised that it may now be used against him.
The victim is stabbed repeatedly. He used everything he had to defend himself: punches, kicks and throws, and attempted two eye gouges and two groin strikes.
None were effective -the assailant moved his head away when eye gouges attempted and blocked kicks to groin.
It should also be noted that although the victim was stabbed many times, he was still capable of fighting and managed to escape – neither person was incapacitated, and both were capable of continuing the fight.
The black male leans forward, revealing his intention to attack as his posture has shifted to load up the punch. The white male immediately clinches and falls to the ground, pulling the other with him. He is obviously very confident on the ground and does not mind which position he initially ends up in, as long as it is on the ground.
The black male grabs the other in a head lock, which is a terrible idea against an experienced grappler as it allows them to take the back.
Others intervene for a second but the fight eventually ends with the white male threatening to destroy the leg of the black male, which is not a hollow threat as he is holding a heel hook.
Rather than reaching for the knife when it is drawn as many people tend to do, this security guard punches the man, and as they go to the ground he and controls the hand holding the knife. He extends the hand away from the body which prevents the man from reaching for it with the other hand. Bystanders step in and assist. Excellent instincts.