As deadly bush fires ravage swaths of Australia, the tale of Lewis the koala offered a glimmer of good news.A grandmother of seven named Toni Doherty had spotted the confused animal dashing into the inferno last week, then charged after him. She emerged from the smoldering forest carrying the singed koala, swaddled in the shirt off her back. He wailed as she doused him with water.But the rescue story didn’t get the happy ending many had longed to see. The Port Macquarie Koala Hospital said Tuesday that its staff had made the decision to euthanize the wounded animal after surveying the extent of his injuries.“We recently posted that ‘burn injuries can get worse before they get better,’ " the hospital said in a Facebook post. “In Ellenborough Lewis’s case, the burns did get worse, and unfortunately would not have gotten better.”