Get a callisto, after bridge wait for the first skedar and kill using 2nd function, then go to the door killing 3 more skedars, after door turn right and kill the skedar, then go to the leader but wait a little, 4 skedars will come, kill them all and kill first leader :P
Go back and do the same way as normal PA... after 2nd king change weapon to phoenix, shoot a lot with 2nd function, 1 or 2 shots will kill all skedars on the last door.
I hope it help you
Or you can just do like Matt did on his enemy rockets vid :P