I am assuming you at bungie create the quests and the job is not given over to a chimpanzee, don't get me wrong I like chimpanzees. Though writing out quests is not a suitable job for them, though i accept that paying a chimp a banana each day is cheaper than using a human. Quest title: Perfect energy. It says: Defeat enemies in strikes with any fusion rifle. I used the crooked fang and you won't believe what happened. Nothing that is what happened. It did not tally as part of the 10 kills required. I have done it now using a different fusion rifle. So please correct me if i am wrong. The word any means any. Yet again you put a secret in that is not needed or you use a chimp to put the quest details. Come on Bugie basics. Again and again players waste their time deciphering you bad quest details, or in some cases no details. It is a habit that needs to be stopped. It is not difficult to give precise details, most if not all games seem to manage it. Thanks for reading.