It sounds like yet another Werner incident.
"
Suddenly I turn around and see the old windsurfer-geezer coming out of the sun straight at me on my six o'clock, full speed. I only just make it up in time up onto my boards and kite off into the opposite direction. If I hadn't been that quick, he would have straight run me over. "What's wrong with you?", I'm yelling at him. His reply: "FU** OFF!"
.. I meet the grey haired geezer again: "What were you doing out there?", he's asking me. "Waveriding, like you", I reply. "This is a windsurfers spot like I told you, you better stay away otherwise you'll get hurt".
"
You would think the Swiss and the Austrians would get along better...

The article doesn't talk about any particular breaking of rules, but just Werner warning her off Werner's waves.