What happens to unengaged opponents?

From the rules, it seems like only player characters choose their targets. So what happens to unengaged opponents? I doubt they sit still, picking their teeth, until combat is resolved. Do enemies also choose targets, in CS order? If so, what happens when an enemy and a player have the same CS: who has priority?
 
Haven't gotten the book yet, but from what I remember of the playtest unegaged enemies are split between the characters, who must then fight mutiple enemies. Might have changed in the final version, dunno.
 
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