I'll wait for the result of the investigation. First, if the police ran the man's name or license through the computer, the officers were likely aware that this man had a record of carrying a concealed weapon record and resisting, and had served jail time for that. Yes, he had his hands up, but he kept walking toward his car and I guaran-damn-tee that the officers were shouting at him to stop and get down on his knees. The video shows him clearly lowering his hands into the open car window, then several seconds pass before the man falls to the ground. All this time, officers were likely shouting at him to keep his hands up and get down on the ground.
Although the article says he refused to put his hands up, the official statement says only that he refused to follow commands. I'd have to see the official police report to know if the article is correct, or if it just made an inference, embellishment, or whatever. Dash cam footage, if available, would have sound, so the officer commands could be heard.
All this needs to be investigated before I'll take a UK article, or any article, as gospel for what actually happened. Police procedure does not allow an individual to walk away from officers just because he has his hands up. Once he reached into that window, all bets were off... especially with an individual who already had a conviction for an illegal concealed weapon charge.