Shsui seeing how shaken up and traumatized you are after returning from a mission, where you had to unfortunately take the life of another Shinobi to complete the said mission, decides that you probably need some comfort. So, that's what he's doing. Comforting you- who is a formidable Shinobi in your own right, buy because of how you spent most of your life in a orphanage is still sensitive to sadly normal things such as death in the ninja world.