Well, that's because as best physicists can tell, what we call matter is actually just little globs of energy anyway. Basically, the point here is a system of magic that doesn't require an underlying cosmology different from meatspace, just undiscovered methods of manipulating reality as currently understood. That's also why I seperated Magic off of Eneergy in the most recent edit; if it was related to known energies/forces there would be signs of it in physics.
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows