OC spray and Taser were used to take the man into custody following this. The police officer suffered a 6cm wound and survived.
An ambush gives the attacker initiative. They have had time to mentally and tactically prepare for the situation. The defender may not be psychologically prepared or have any kind of plan, and is at minimum a few seconds behind the attacker to even understand what is happening.
The cop who stood there for a few seconds either did not understand what was happening or was in a kind of denial for some time. This is not a conscious decision made while observing the situation. It is likely a result of inadequate training.
Reluctant to go hands-on, police use their baton, then Taser which fails multiple times. One police officer attempts to knock over the man by rushing at him from behind but ultimately loses control as he stands up. The Taser is used again, then OC spray before the Taser is used once more before the man is taken into custody.
All of the tools police used in this instance depend on pain compliance, apart from the Taser which incapacitates for mere seconds IF the two prongs make contact correctly and in the correct positions on the body. Physical control with grappling techniques may have resulted in a faster and safer arrest, however these officers either lack those skills or were not willing to go hands-on.
These cops first attempt to control the man by grabbing the wrists, just as they have been trained to do. The suspect passively resists, denying control. The cop then moves to the schoolyard headlock which is similarly effective. OC spray is then used which also apparently does not work. A second man begins to intervene. Video ends with no resolution.
Police in the state of Victoria, Australia use pain compliance to handcuff a mentally ill pensioner.
The police officers used a baton and OC spray to achieve pain compliance as they were unable to handcuff the man by physically controlling him, perhaps due to lack of skill and/or malicious intent. Once he is handcuffed, a garden hose is used to decontaminate the man of OC spray, and this action has been interpreted by the public simply as further means to humiliate the man. An officer pulling out his personal phone to film the event only makes it look worse.
Pain compliance (OC spray and baton) are ineffective against this man, and the police involved lack the skills/ability to physically control him. Backup arrives to assist, but it appears that the man could have overpowered the two police officers in the meantime had he decided to.