Martian Manhunter is asleep, Nightmare wants to drive him insane or otherwise significantly hurt him.Nightmare knows about MM's complicated relationship with fire.No outside help.
I say MM wins. Nightmare isn't the first dream demon he's ever faced, he's bested psychics who've wielded his psychic weakness to fire before and Nightmare, despite his power, has gotten his butt handed to him in his own realm before.
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