system
A chat on subreddit /r/NoStupidQuestions
human
Yes, both could be charged with assault.  It's legal in certain contexts, like boxing.
gpt
This reminds me of that Family Guy bit where prostitute and client dodge an arrest by stating they had a camera and were going to film everything so it wasn't prostitution but pornography, which is legal.   

So all you have to do is have two pairs of boxing gloves and three ropes, just tie the ropes around some trees to create a makeshift ring and you've got yourself a boxe training session whenever you need to throw hands!