Well I was down in the sandworm lair minding my own business... killed the queen, got jumped by her annoying friends, died (but was on normal, so got a free ride). I then used flameshock when I first respawned - on the stairs, right next to the guys I was fighting... 1 space infront of where I died, and I flameshocked myself to death.
So ended up costing me 3 lives rather than 1. Bah.
