Ok, I'm facing a small problem in the table I'm DMing. And that's the death threat. One or twice I had to let the PCs survive an encounter they were going to fatally lose, due to some bad strategies from them, and some overpowered encounters from me (the encounters were about 4 or 5 levels above them). I don't want the PCs to die, but I also don't want to erase completely the death threat. I just don't know when to let them die. So, any of you have had this kind of problem? What would you do?