I just sparred some nerd and AT LEAST 10 times within an hour the spar was interrupted by random animal attacks. It was made this way because somebody screeched about fueling maneuver on boats, which this hasn't stopped at all. We just drop group and aggro then reinvite when we're off of the boat now.
Annoying + no upside, but if you want to keep some form of it for no reason then at least make it so onlt combat relations with other players end spar.