Powers & Abilities Mereoleona affecting Vetto

#1
Why was Mereoleona able to affect Vetto ? As a demon magic user shouldn’t he be immune to regular magic ?

There are 2 theories I have-

1. Mereoleona is Arcane Stage

2. Mereoleona’s magic wasn’t actually affecting him. It was just her brute physical strength that was damaging him. I don’t think Vergo was ever shown to be burnt. It was the actual force of Mereoleona’s punches that was damaging him.
 
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