Note that there are multiple sides to every story -- yours, theirs, and the truth is somewhere inbetween.
I see this from both sides of the coin:
1: While an instructor is doing drills on a platform, don't just drop down on it. Go somewhere else -- there's an entire quarry out there, but right now there's an instructor with their student(s) here. They need to be focused on the task at and, and dropping right down on them is distracting and rude. Your instructor should
not have let their student kneel on the platform for their safety stop (skill issues aside) while there was another class taking place on the same platform.
2: Shoving the offending diver away is also quite rude. Perhaps a simple "please move a bit further away" signal might work better. That instructor doesn't know your student at all, and doesn't know whey they are on the platform. For all he knows, that guy was there just to distract him and his student. Shoving your student was certainly over the top and unprofessional, but so was letting your student sit near this guy and his class.
...
assault?
Are you kidding me? That wasn't assault. Assault is someone coming after you with a knife or maybe beating your brains in. This was someone shoving...but I'd hardly call it assault. No wonder our nation is becoming more wussified every day. You people want to bring the police and lawyers in to this? Are you nuts?
...and people complain about us turning into such a litigious society...
How hard does it take to push someone over so they lose their balance while underwater? Most people have issues kneeling while balanced on a platform anyway,
especially new students. For all we know this guy just attempted to push the student a bit further away to allow for more room for his class.
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....so now we have some new facts. You were in front of your students, leading them around the quarry, and one was apparently so far behind he was out of visual range.
Instead of you watching your students and having them in your sight AT ALL TIMES, you are playing
follow the leader, with your students having the burden of keeping up with and following YOU?!? How can you possibly say you had any control over your students at all, if they are
behind you and you can't see them??
YOU are supposed to watch THEM, not the other way around!!!
Playing follow the leader is not an acceptable way to teach diving. For all your know this guy could have been having a heart attack and drowning, and you never would have known it.
Sounds like everyone is a bit guilty in this story.