[Maybe he'll unlock the meaning of life and how to deal with grief. Or summon more ghosts. Instead of wondering more, he sits on the bench and, after taking a deep breath he starts to play. Nothing fancy, just a simple tune he easily falls into and later realizes it's the same he played for his mom and Dante after the whole mess with Snart. And somehow it makes him feel close to his brother.
He wonders if that was the point of all this as he finishes up playing. Date's ghost doesn't show up again, but he finds himself not minding too much.]