Could be a catch and release if it truly was feral.
Other than a youtube video, does anyone have any proof that the cat in the video was the same cat that was killed by the vet? Has anyone ever dealt with 100% feral cats before? They are not ones to be messed with.
I was 100% convinced my Manx (or manx mix) cat was feral. He was always around my apartment complex, hiding under cars for warmth in the winter. He never begged from people and running away if anyone got near him. He was covered with scars and wounds from fighting with other cats. He was often limping with broken limbs or swollen / infected paws. His face always looked disgusting. I was convinced on multiple occasions that he was dead or had no chance to survive. He even seemed to be deaf sometimes. This went on for years.
A new neighbor moved in. She's a "cat lady" and spends a great deal of money to rescue cats. She managed to capture him. Spent thousands of dollars to fix him up. The vet confirmed that both hind legs had multiple major fractures that had healed over the years. I always thought the tail had been cut in half, but the vet told her it was actually a Manx cat. She got him neutered and nursed him to health. It's like a completely different cat. He's super-attached to people that he's familiar with. Very smart (for a cat). Very vocal and affectionate. The only reason she gave him to me is because he has feline AIDS and will not get along with her other cats.
Back then, an arrow to the head would have put him out of his misery. Today, he's a very happy and loving cat.
Truly feral cats typically don't ever become tame, especially grown adults. I think he used to be someone's pet that switched into "survival mode" feral instincts after being abandoned.
Tiger was clearly not a feral cat. As a vet, she should have trapped him and checked him for a microchip. Perhaps she should have started a sterilization program if she had a problem with feral cats (though Tiger was probably already neutered).