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I wanted to expand on this idea (since it's been keeping me up at Night) my three thoughts on this are:
#1: There's an angry trouble maker running around.
#2: An AU where you need to get both of the sides of Nightmare back together if you ever want to kill him since they just respond back with each other.
#3: The easiest during a burnout...
Ta da
Nightmare and his angry little Chihuahua version of himself.
Red and blue make purple, right?
Passive!Nightmare is purple, so you can take purple apart into two colors, red and blue..
Corrupted!Nightmare is blue/cyan, which is more often associated with the feelings of sadness.
But who is red?
And that's how I came to the conclusion that there is another, anger (and preferably smaller) Nightmare out there.