Life can change in the blink of an eye. This Channel 4 documentary about horrifying assaults makes this clear from the start. Straight away it was immediately gripping, in the style of mega-hit Netflix documentary Making a Murderer. We instantly sympathise with this baby-faced boy called Ben, talking to the camera about going to a party and snogging a girl. It’s a teenage romance. Then a drunken fight breaks out and it all turns sour. Ben describes the fight and how he was involved albeit unwillingly, defending the honour of his friend. “I’m not a violent person,” says Ben. We nod. Look at his face. How could we believe anything else? Then another face appears, another young man who was there at the party, and says no, that’s not what happened. Ben hit George with such force that he died. CCTV backs this up. Our view flips 180 degrees. What an ingenious way to start.