No arrests have been made yet in two shooting cases from Kalamazoo this weekend.  The first happened at around 2:30 Saturday morning when a man was shot in the back at a party at a house on North Rose.  The victim is expected to recover.  The second shooting happened Saturday night shortly after 11:30 when a 13-year-old boy was shot in the back as he left a party and was walking near Lake and Maywood.  The teen was taken to Bronson by a friend where he is in stable condition and is expected to survive.