I would separate them, too.
I've kept and bred dumeril's and they were always mellow. Agressive feeders and breeders once they got older, but always cool towards other snakes-even in breeding.
I had a pair in with a group of colombians at the time, but the males didn't bother each other at all. I theorize that the presence of the other male stimulated breeding, but they never did the “combat thing” to anything.
I hope they both turn out okay!
Maybe you have an improperly sexed male. Their tales are a lot fatter than colombians so maybe they didn't probe right.
Aaron

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