It's also something that insects do. The 'hive' might send in a single Ant to probe around in a kitchen, and then a while later all his buddies start to come along too. And as we know, the Borg's behaviour was (originally) based on the behaviour of insects, specifically those hive mind species like Ants or Bees. Agreed, BillJ. There's very little ambiguity there, the Lakul was apparently escaping from the Borg cataclysm. It's sort of a continuity error, but it was probably an intentional one, for dramatic purposes.