I dont really know what I'm watching?
In the UK we have an unwritten rule of z zag formation as well.
I'm guess you wasn't braking a lot then?
Can't really tell if he's trying to pass you up or ride side by side. Either way, you stay in whatever order you roll out in, unless you're an enforcer or like you said a filming the ride etc. Some folks just don't got it for road formations. That's why practicing as a group is important. Is this a riding club you're in?
As for the question, I would have waved my hand at him telling him to back off. Do you know the common hand signals?
Ah, yeah I have a friend that's in HOG. Never takes it seriously though.