He really shouldn't be that surprised at this turn of events. Their eagerness for each other has brought them into worse situations, but tumbling over the railing of their house is a bit of a new one. He can't believe it's happened, but on the other hand - even after all these years (decades) they can still fall to the ground like teenagers they haven't been for centuries. It's a good feeling.

She breaks his fall and he'd be more concerned about having crushed some part of her if they weren't immortal. He steals one brief, surprisingly chaste kiss. "It would have been a hell of a way to go out."

Cassian supposes that is one thing he could hope for, when it's his time. That Jyn is with him. Not necessarily to die with him, just be with him. He reaches out to brush some of the hair from her face, not bothering to move away from her. His hand lingers, cradling her face, thumb gentle over her cheek. "At least we have another new project. Fixing that railing."