Alone at the nurse's desk of a hospital, Dr. Steve senses something. When he notices the open door to the blood supply room, he goes to his office and quietly retrieves the crossbow from his locker.
The thief is drinking a bottle of chilled blood from the fridge when Dr. Steve surprises him. The doctor is able to fire a crossbow arrow into the man's heart. He falls to the floor and shortly dies. Using magic, Dr. Steve is able to clean up the mess - crumbling everything into a dust that blows away.
Pleased with the outcome of the encounter, Dr. Steve locks the door and drinks just a swallow of blood himself. This supply is his and his alone.