Another way of looking at it: Why would 2 fouled ships drift, while 2 immobile ships that are playing at "motionless bumper cars" not drift?
Because one of the two is not really immobile, it is using the wind in its sails to bump against the other
(This is not to argue that we must keep it the way it is - as I've said, if enough people show support in favour of the switch, we'll switch to the interpretation you suggested).
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