Monday Night Madness, every Monday 8pm CST in SEA2 is a very fun event that does help one get better at certain aspects as well as have an hour of intense fun.
There are very few rules which are clearly explained, one being the request to not HO others. It happens, sure, but it's not constant. The films are typically how I fly and make judgement calls on taking shots.
Here are some examples that may help you see the difference between a "don't take a HO shot" and "takes a shot that may look like a HO but isn't. You'll also get a glimpse into the MNM arena, however you will not see the haze/fog layers we see or the reduced icon ranges in play.)
These films are from June and early July, since only 4 can be posted in any response, I will post 4 each in the next few replies with a little info on what to look for. You are welcome to ask any questions.
I'm sure others can post films showing what a HO actually looks like (I posted one of me doing one, my bad, but I'll claim reflexes. At least I found 1.)
Here are the first 4 (most are under 3-4 mins):
The film titles are kind of self-explanatory. Notice the nose to nose solutions where I do not fire, and look at the ones where I do.