<human>: Can you provide a brief overview of the text?

Me and a buddy were walking home, this dude stops and starts getting in our face and follows us home, after which I walk off to not be part of the problem, the rando from the street follows me. I try and convince this rando to go on his way and that me and my buddy were drunk and that the rando should just go along and let us be. This rando proceeds to follow us and start a shouting match near our place, my buddy grabs an airsoft gun to get this guy to leave us the fuck alone, but he doesn't leave. I am far away watching at this point to make sure my buddy doesn't get into a fight he may or may not be able to handle. Eventually after my buddy shooting this dude with an airsoft gun he fucks off. After which we go to a party and we see this dude on the street. My buddy has his airsoft gun and shoots at him because he was being such a douche earlier. Later this guy has posted a letter on our door (no clue how he knew which was ours) saying to call him if we knew the people he had met (gave him false names). Is there any legal trouble I could get in witnessing this going on? I was trying to stop shit from happening and have people go there separate ways but no one was listening to me.
<bot>: Some dude on the street followed us home, buddy shot him with airsoft gun, I watched ready to jump in if fight broke out, any legal reprications?