She reacts without thinking. Even tough she can hear him calling, as she turns and locks her gaze on him, her hands move and she seizes the muscles in his legs. Then she gasps, coming back to herself enough to realize what she's done and to whom. Nina releases her grip and moves through the snow toward a somewhat crumpled Tommy Shelby.

"Sorry, I wasn't-- I didn't--" She wasn't thinking. She didn't see him. She isn't sure which is more accurate but it doesn't matter: she is better than this.