I won't get into my personal choices about how I decided on who is a friend or not but after all of this he's certainly not somebody that I want to be around. Friends come and go and I always choose to separate myself from toxic relationships, this is no exception.
Also, I don't know about you but when somebody starting "throwing around a pool cue" as I mentioned he was doing in my post I consider that pretty dangerous to the people around. I don't mean he knocked it onto the ground, I mean he was pretty much whipping it all over. Grabbing it by the shaft and throwing it - could he have hit me, or my friend, or broken any number of things in the basement, yeah? It was a pretty obvious choice to subdue him because martial arts are also used to subdue hostility, especially in such close proximity.
As for my Karate teacher - I will explain what happened to him as I had planned to already.
Yes, of course. You mentioned how annoyed you were about a pretty cue being smashed and now it becomes you were actually looking out for the safety of others at the time

Yes, being young also means defending your bad actions. I don't much care who you're friends with, but if breaking one cue is the cut off point, you were really not a friend of his to begin with.
You need to grow up a little. Now would be a good time to start.