Hmm.... why can't you just make the West soldiers captives using:
this setcaptive true
in their inits...
and then when you want em to get shot change it to
unitname setcaptive false
in a trigger or waypoint of the East squaddies...
Once they're no longer captive, the East guys should bust a cap in em all by their selves... eliminates the whole dotarget, dofire stuff ;D