What Are These Lights in Battlefield 4?

Okay, while playing Battlefield 4 a couple of nights ago on the PS4, I saw this on the Paracel Storm map during a game of Conquest. What are these lights?  I'm still relatively new to the game, so I might be missing something that everyone else already knows.

My current thought it that it's ancient aliens because everything is the fault of ancient aliens. True story. Perhaps they are the ones resurrecting enemy soldiers, thus turning them into undead killing machines, which is why I'm still being killed by people with 0 health. These aliens may also give the enemy all those nifty superpowers so they can shoot me through mountains and from across the map with assault rifles.

Or not.

If you know what this light is (I've only seen it once), let me know! I'm off to do research.

UPDATE: I'm not crazy. Others have seen it too. Still don't know how to make it happen though. See this video from One Handed Gamer.