Running Wild: Mischief clairification, Question on how to use Mischiefs in combat Options

[Wacky]

Greetings all!

Was thinking of using a Mischief (rodent-sized animal swarm) against my players in an SR4 game tonight.

My thought was to have the toxic magician they'll be battling use the Control Pack spell to summon forth a group of mutant Norweign rats on them.

I had stated the rats out (more strength and better unarmed combat skill, final essence 3), but then had pondered what to do about them fighting together.

Remembering their was a passage on that in Running Wild, I looked it up (page 25 of the book). But it didn't say much on how to use them. All I know if that the body for said swarm is the group size +2. For a large number of rats in a Mischief (15 in all), that'd be a body of 5. But how would you determine the number killed from a shot from a gun or spell?

Do I just have individual condition tracks and follow them all or what? Any advice will be appreciated, and don't fell rushed to get it to me tonight--I can always use a swarm later on in the game...maybe a group of devil rats throwing mischiefs at the party when they invade the rats' home...

Sign--
Wacky