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Before the Well Actually guys chime in, yes a boat can still move without a rudder, but not safely (i.e. steering is gone, most boats don't like to collide with things or begin veering off course) so when you lose a rudder on a sailboat you usually stop, heave to, and stay in one place while you figure out what to do.

That the orcas are watching this unfold and connecting the dots and then collectively deciding that rudders are their new target is kind of amazing.