Enma has a personality, and is concious of what is right, and what is wrong. If Hiruzen decides to summon him to fight against the allied forces, I think he'd refuse. If the Hokage somehow overturn the ET, then Enma will rip **** up.
Not sure if he has a choice or not. Hiruzen is somewhat his master.
Edit: Never mind, I just remembered how Gamabunta acted when he was summoned. Or when Manda threatened Orochimaru.
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