You forget that the martial arts Yinghua and Luo Hao do ARE magic. Ki or Chi is just another name for the magical energy Erica and the others use, too.
As for Doni's "leaping"... I don't know if he could do it before becoming a campione and I don't think he properly learned it, but he's the kind of guy to just figure it out on the spot when he needs it.
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