No. The only light I bring anywhere is the aforementioned night vision goggles.
No. A square can't spawn metal wreckage and mines both. Plus I was standing still putting on night vision goggles.
Well I'm buggered if I know unless there's rocket turrets or tanks with infrared vision.
.50BMG turret is one of the roadblock possibilities. I'm wondering if the NVGs somehow interacted with it; may take a look.
Update: checked (borrowed a handy sewer) and the goggles did nothing. If there was a lightning storm, that might have done it. Otherwise, possibly some other freak lighting. What you're describing sounds like a fairly freak occurrence.
In any event, latest experimental would have given you a laser-lock warning had the turret targeted you (you have one turn to save your ass, use it well). It also seriously downtunes tank drones' use of their main cannon, which I designed more to kill smug vehicle-users and tweaked more to that use at the same time.