Billie has magic that she doesn't know how to use. Unsurprisingly, Strange's response to that isn't 'be sympathetic and offer condolences' but 'try to help Billie find a way to turn that magic for the better. He pauses for a moment, frowning as he thinks.

"Someone who's opinion I trust offered the suggestion of focusing and trying to direct the magic once it's started. That's stopped me from accidentally shocking people. Perhaps it can help you as well?"