Stein is just minding his own business, pondering the whole situation, when he feels a sudden urge to turn his head. Why, he does not know, but he trusts his instincts (mostly...the shadowy movements are starting to make him wonder) so he does so. And about two seconds later he determines his instincts are still as sharp as ever because what do you know, there's Spirit.

Stein...stares at him, expressionless. Spirit will probably come this way any minute anyway.