If pure-blooded Garleans can't use magic...

[kyrios91]

Then what is Gaius doing while you fight him in Praetorium? How does he teleport, use that blue cross skill, and make that blue fire area around him? I don't think it's magitek or straight up machina like Nero, Livia, and Rhitatyn use.

Any answers/theories? :O

The blue cross skill and teleporting is common, you don't even need magic for that. Paladins create a huge shockwave from Rage of Halone, Dragoons can jump really high with only using their legs, Monks can create a huge shockwave with their fists, etc.

No need to think too hard about logic since we're in a world where you get hit by a hellfire to the face and only lose 1000 HP.