She doesn't respond much to the first part of what he says -- if anything, clouds further with worry and uncertainty, as though she couldn't believe such a thing herself. The idea that Steven might be lucky for knowing her . . . that seems like an impossibility, given that she only may compound the challenges of this mission -- get them both hurt, perhaps, or even worse.

But the second . . . immediately he'll find her eyes on him again, the doubt whisking away. ". . . You saw him? Steven??"

That can probably be safely taken as a "yes."