He can do this, he's got it, he'll just try and talk Yuya down and reassure him and not have him worry.

"He knew it happened when I accidentally lit myself on fire," Strange explains. There's a few big differences between 'accidental fire' and 'weird new blood' and this is one of them. "And look. If she does come again, she didn't go after me when I was mad, hallucinating, and set the alleyway on fire. I'll just...you'll come to me, I'll set everything on fire again, and that'll scare her right off."

Maybe? Strange is coincidentally forgetting that fae didn't go after him because there was a much easier, less flame-broiled target in the form of Gongenzaka.