Corrected entry: When you kill a boss or a mini boss, if they fade away after they die you won't face them again in the game, if their corpse remains on the floor, there'll be another encounter with them. (The garador, el gigante).
Ictoabu
31st Jul 2007
Correction: Not true both halves of Mendez stay right were they are, and if you can kill the right hand without the liquid nitro he remains as well.