Othinus is still human, right? What define a magic god is the ability to create magic at god's level so she can be defeated if Touma manages to get in contact with her. Maybe that was the reason she decided to remove his right hand first.
Oh! And there is a difference between "the power" inside Touma X Fiamma and "the power" inside Touma X Othinus: he passed out before getting in contact with that power.
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