You're arguing over why the cops shot the man.
He had a knife, a deadly, close-range combat weapon.
According to the rules of engagement, which sometimes differ by state, police officers are required to unholster their sidearms and be combat ready whenever the pursued suspect reveals a weapon.
The next step in protocol for said officer(s) is to shout commands to said suspect(s) in order to verbally force them to drop/put down the weapon and surrender.
However, there is a limited time for this. If after a certain period of time passes and the suspect has not put down his weapon, or has attempted to use the weapon within that time, the officers can engage with deadly force.
This is how it works, people. This is not a matter or police brutality, this is a matter of a suspect not cooperating, with a weapon, and being put down by law enforcement.
On the matter of tasers and mace, yes, they have been used to neutralize suspects with close-up weapons, however, not every police officer carries a taser or a can of mace. These 5 or 6 officers could've easily been unequipped for that and just carrying the standard issue sidearm and other standard gear.
As for batons, that should just immediately be out of the question. No police officer would pursue an armed suspect with a night stick, that is stupid. You might as well ask to be stabbed.
In conclusion, no, this is not police brutality.
Any argument to say otherwise is invalid because cops do this every day and it is standard issue protocol.
The simple answer: the suspect refused to cooperate and was put down by the quickest means available, as required by law. Law enforcement agencies make these protocols to reduce officer casualties as much as possible.
As for the amount of shots, that is meaningless. There are 5 or 6 officers all armed with standard issue sidearms, probably glocks, so most likely a 15 or 12 shot magazine, all pointing at the same guy.
It is also part of protocol that when one officer opens fire with valid reason, all accompanying officers must follow suit. Of course 46 shots would go out in 5 seconds.