If you go back and look at the early footage of Greg Knoll and Mickey Munoz etc there was always more than one person on those waves.
In most of the footage I have seen of Mavericks same deal no one seems to call anyone else off either.
Both riders look in control.
Just because its an SUP doesnt make it a crime, if it was a another guy on a 12ft gun there probablly wouldnt even be a peep.
Phill