Grave yard

[LCARSx32]

Its a 20 second exposure lit from behind your shooting position. My guess is that its a bug, light reflected off the bug itself, result is a mild light trail of the bugs flight path.

^+1

 

[Boomn4x4]

I'm guessing its probably stray wire from your proton pack.

 

[Nautifish]

So its a bug?

 

[bazooka]

That'd be my vote.