[ The customs of his people? Well, that confirmed that the tall blue lady wasn't tall and blue because of the carnival (ever since one of his closest friends grew a tail overnight, Strange has learned not to question these things). Still, Strange is taking this all in stride as he answers, like it's the most simple answer in the world, ]

I am a magician: I was using magic.

[ It's said as if it's the most obvious thing in the world. Of course, Strange knows people can arrive at the carnival from worlds without magic and the likelihood that he'll have to explain the ins and outs of magic to the tall blue lady is quite likely. Still, he doesn't mind. Strange enjoys talking and he enjoys magic, so naturally he loves talking about magic. ]

I'd be happy to talk theory. Or, if you wish, I could explain in detail how certain spells worked