Jeez that's close xD Can't let your mind slip in that place ^^ You kind of deserve it when you stay at that place when they are spawning....
Not playing much this season.. had a few near deaths in the past though. The scarab demons' lightning bolts can deal some insane damage. Same goes for rakanishu. Diablo and mephisto are classic traps for newbs, for dealing high damage. Also, the first bane of mine with hc deaths was cold enchanted boss monsters, in hell mode. They can deal pretty high damage.
Good you survived though. It's the only way we learn to play better in hc. Dying is extremely sour ^^ All that progress and gear is lost. But that's why it's fun. It's like gambling with real money instead of monopoly money.