This is a strange bug I just discovered while playing my most recent map. Apparently, it's possible to get two items from a enemy you kill, as long as the enemy drops an item as told to do so in mapedit.
First, kill an enemy that drops the item, such as a life essence. Pick it up. Now blow up the corpse with an explosive weapon. And presto! You have another item!
Duplicate Items From Enemy Corpses
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