This picture is showing how Oscar is lying on the floor all sick and junior is all worried about him. His mom is in the background because he calls her to ask her what they can do about Oscar.
This picture represents Junior bringing Oscar outside because his father tells him to take him outside because they have to stop the pain he is going through. Junior is crying because he doesn't want to loose his best friend.
This last picture shows Junior's dad putting Oscar's misery to an end. While junior is all sad about never seeing his best friend again.