For the fireteam: Get one hunter with Celestial Nighthawk fully upgraded. Get three decent rocket launchers (truth, Gally, hunger). At round 5: 1.Before going outside everyone needs to pop a heavy synth and wait for it to cool down. 2.Go outside and as soon as Quodron appears unload all the teams rockets at it. 3.Run to the far right and stick together so when the detainment fields appear they capture all three guardians in one. 4. Make the hunter with Celestial shoot al three shields with one shot (no need to kill Qodron's eye). 5. Everyone pop another heavy synth and shoot all rockets at quodron. (If you manage to kill the Eye it helps a lot) You should be done after that second heavy unload.