All fights are matters of life and death.
I've had dreams where sometimes I stay and fight, and sometimes I run...usually against overwhelming odds, like 30' generators hitting me with lightning bolts and paralyzing me. That was the worst nightmare I recall, and even then I was almost stronger than the electricity. I defied it to the point it almost killed me...so to speak. This was in a futuristic setting where a flying saucer would be right at home. (Too much TV!!! )
I have never fought anything like Nazcul or cave trolls in these dreams. I think I would be prepared for them if they ever showed up in a dream. Don't know if I'd run or not.
Les