Why did the Crown appeal the accused's acquittal?

One summer afternoon in 1992, Todd Johnston went for a ride with his girlfriend and two friends, Jason Boyd and Cory Goodine. After driving on some country roads near Arthurette, New Brunswick, Johnston stopped the truck. Without warning, he shot Boyd in the head with a revolver. He then removed Boyd's body from the truck and dragged it a short distance. Still holding the revolver, Johnston ordered Goodine to "get off the truck and help me because you're in on this, too." Goodine obeyed Johnston's orders to drag the body into the woods. When the victim moaned, Johnston shot Boyd again in the back of the head. Medical evidence at trial indicated that either shot would have caused Boyd's death. A few days later, Goodine told two of his friends about the murder and led them to Boyd's body. The next day, the friends reported the incident to the police, who arrested Goodine and charged him with being an accessory after the fact to murder. The accused was acquitted following a trial by jury. The Crown appealed to the Court of Appeal, but the appeal was dismissed.