This was a bug in the original game, but sometimes NPC hold on to their still-activated lightsabers even after death. Sometimes, the lightsabers remain active even after the body has been removed.
This is especially noticeable after spawning and killing a few dozen of Player NPC's. Every time you switch to another weapon and then back again, they all re-activate their lightsabers. I suppose dead NPC weapon switching is itself a bug.
This was a bug in the original game, but sometimes NPC hold on to their still-activated lightsabers even after death. Sometimes, the lightsabers remain active even after the body has been removed.
This is especially noticeable after spawning and killing a few dozen of Player NPC's. Every time you switch to another weapon and then back again, they all re-activate their lightsabers. I suppose dead NPC weapon switching is itself a bug.