There were a lot of reasons to be tense around Faust, not least because he could be terribly creative with his powers when he had reason to put his mind to it, but if Faust had to put a finger on why he had a strained relationship with Samata, it was probably because she had no thoughts about the repercussions of her actions, and also because she seemed to assume an awful lot about him because he was a sorcerer.

Little things like that.

"Nothing wrong with explosions. Even big ones - makes an impression, right? Unless a spell to throw fireballs is going to have a practical application, I guess." Faust can't really see if there is one. But that's Samata, always looking on the bright side of things.