Reef and Leeza
The entire story can be interpreted as an ironic twist of fate. Leeza ends up in hospital because of the stone Reef threw without thinking of the consequences. He comes to the same hospital Leeza's in to volunteer in order to learn his lesson and to expand his view of the world outside his anger and aggression-filled bubble. Of course, there he meets Leeza, and they start to like each other. He gives her moral support to keep going and to see the future. This makes the ironic reveal at the end of the novel the more devastating.
Scar
Reef is far from being a role-model character, his treatment of the opposite sex included. However, Scar could be seen as someone he truly cares for and sees her potential of being much more than she believes she could be. He sees her kind and giving nature, and he refuses to take advantage of that.
"You did a really good thing, Reef."
It is what the nurse tells Reef before he's about to meet Leeza's mother and before the truth of his identity is revealed. The nurse implies his role in the progress of Leeza's recovery, but the double meaning of those words is ironic, because Leeza's mother will indeed tell him how she feels about what he did.
