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I'm sorry but 'Please leave' is pretty unclear language from the get go. Firstly, the togs had to deal with the probably astonishing OMFG-is-this-actually-happening shock of the situation, followed by trying to dissect what he meant by 'Please leave'.
'Would you like me to get in my vehicle and drive away officer?'
'Do you want me to simply move back?'
'Where can I stand?'
All of these are reactions that would be perfectly understandable in the situation and neccessary to translate from what is being said to what is actually being requested.
I imagine you're right, a convo probably did not happen, but the experiences of myself, and many other photographers here tell me that having a polite and respectful up-front conversation with the officiant ahead of time doesn't preclude this sort of behaviour and similar.
At the end of the day, this is not analogous to a kid being told to move off someone's front lawn. His request may interfere with the photographer and videographers ability to do their job. I'm not saying that it will, or that it should, but it may. We get paid good money to photograph peoples nuptials and while I always go out of my way to be respectful and cede to the officiants wishes, the reality is that it's not the only consideration.