I have put up a video of the 4th Petra bounty from today. Hopefully it will show and explain how they work too anyone that hasn't given them a go yet! I recommend doing them with friends if you can because some of the fallen have some major health bars! I have tried too explain how they work as best I can but if I missed anything just let me know in the chat and I will add it here!
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Some folks in our clan put a fireteam toghethwr and went and wrecked all four of these today. They are a blast. You can complete them multiple times for the chest too which is a plus.