A mage has cast a 'Beast Friend' spell on a swarm of creatures -- say, a swarm of Razor Wings. The swarm then takes a wound and splits into two swarms. Does the mage now have control of all of the new swarms, or only one of the new swarms?
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Only one of them. They are treated as two separate creatures. Remember, "Beast Friend" doesn't have you "control" a creature. It has the spellcaster "guide" the creature.
None of the above. When a swarm takes a Wound, it is Incapacitated (generally meaning that it disperses), just like any other Extra. Wounding a swarm doesn't split it. The description of swarms' "Split" ability reads:
It says nothing about them splitting in response to damage.
If the player suggests to the swarm that it should split, then I would allow him to maintain control of both sub-swarms, under the following conditions:
The end result is then identical regardless of whether he used Beast Friend once on a medium swarm and split it or used it twice on two separate small swarms - it costs 6 PP, takes up two actions, and counts as two maintained spells either way.
Or you could have it that the two smaller swarms can only act as one. They both attack the same targets and go to the same location etc. There are still the same swarm of creatures just now there are for mechanic reason treated as two smaller swarms.