Kate holds onto the pictures she's slipped into her coat pocket earlier in the cab, as she jumps down the bridge and into the past.
She's not sure she'll ever understand why she's in those pictures; Stuart's explanation sounded more like a riddle than anything else, but that doesn't really matter right now.
All that matters is getting there in time.
It's kind of ironic that her intended destination is the same building she's just left, and yet not the same at all. The valets refuse to let her in, then Otis shows up.
Kate breaks into a sudden smile.