No cop is going to walk up to a formation that's heavily armed and organized and randomly pepper spray over them.
An individual, maybe. They can be singled out and attacked. But an organized group in sufficient numbers, all heavily armed, no way these cops do anything other than tuck tail and run.
Historically when a group shows up en mass heavily armed there is no violence taken against them whatsoever.
Oppressors look to control by intimidation and violence but rarely do they want to deal with true resistance.