I think in practice (from the US) they come in with 10 people, guns drawn, in bulletproof vests ready to fire at anything moving just in case which leads to unfortunate deaths which is why 'Swatting' is so dangerous in the US
https://www.youtube.com/watch?v=9piU6_8y61Q
Here's a recent video of a cop throwing a woman to the cement who was in a fight.
https://www.youtube.com/watch?v=DCKu-0oAaOk
Here's a compilation of nearly 1000 incidents of police brutalizing BLM protestors and reporters.
https://www.theguardian.com/us-news/2020/oct/29/us-police-br...
In these incidents the victim was clearly either unarmed or in no way was threatening the police with a firearm. I think that is just yet another excuse the police use to evade prosecution when brutalizing citizens.
This is nothing new, here's the police brutalizing citizens protesting in Chicago in 1968.