Unfortunately, I wasn't able to get video evidence of this occurring, but there was a clan in Iron Banner, where every time you killed one of them, they would drop heavy ammo. Not sure if this has been reported or Bungie is aware, but if they know how to pull off this exploit, I'm sure others do or will. I have reported the members of that clan.
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Edited by piratepatchy243: 10/20/2019 6:17:48 AMIf you die with heavy ammo still in your weapon it'll drop for any and all to grab, just like how special drops when you kill someone that is using special weapons. Now if this is before heavy ammo is available you have something that needs to be looked at. From what you're saying it's not the later and is working as intended, also if I remember correctly heavy ammo is dropped to all those around it once opened which is how it was in D1.