It's not the smirk that makes Isabela skeptical, its that it doesn't sound like a wound a shark would inflict to her. She'd seen shark bites before. But maker knows she wasn't an expert.

"Well, cheers to good fortune, then."

She points to a recent scar on her stomach- it couldn't be seen through her sweater dress but it was clear as day on the reflection. "I stabbed myself. Sort of. I actually stabbed something that was saying it was some kind of figment of myself, but it wounded me too. Almost bled out in the street."