Ways to calm down quick so I dont punch my fucking neighbor?

I seriously want to punch this guy in the fucking face so please give me any sort of method that I can use to calm down.

Backstory: last night my neighbor (late 40s fenale) was punched in the face several times by a random crackhead. My boyfriend (26) ran outside, shoeless, to defend her. During this my neighbors ignorant, piece of shit son (maybe 19M) pulled out his phone to record. And who did he record? Me and my fucking boyfriend who were there defending his mother. What makes me want to smash the kid out? As soon as the cops showed up, this waste of space screamed "He has a gun! The guy in the white!" The guy in the white was my boyfriend and he did not have a gun on him. But this scum bag made it so every single cop that arrived on scene (like 10 of them) drew their weapons and pointed them at my boyfriend. The fucking low life was still recording this, continuously pushing his cellphone in my face. So I warned him. I told him I will take his phone and fucking smash it if he doesn't back the fuck up and get out of my face. His mom is screaming at him the entire time to stop being an asshole and asking why he is trying to get us in trouble when we are the ones helping them. He completely ignored her. Instead he tells my neighbor (30M) that he's going to fucking kill me and my bestfriend (24f) and we better watch our back.

I'm not afraid of the fucking puke. After he said that, I did take a step towards him because admittedly at this point I'm losing my cool and want to kill him. As soon as I stepped forward, he jumped back several feet and again, started recording me and saying I'm psycho.

What can i do to calm myself down because all i keep thinking about it the fact that he lives just 2 floors down and deserves to be smashed the fuck out.
Ways to calm down quick so I dont punch my fucking neighbor?
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