I saw it and didn't see anything wrong with what the officer did. Contrary to a lot of folks who feel that the old, the small, or females (primarily because of their small size) should be treated gently, I see no need for such kindness. The notion that somebody like that old lady, who was waving a gun around and threatening to shoot people in a parade, should be treated as if she was overly feeble or weak is a huge tactical blunder. There is no reason to assume that the old lady would be safe, docile, or compliant once she got rid of her gun. More over, nobody knew if she had any other weapons on her. Considering the facts, if the lady was willing to threaten folks with one gun, then you gotta figure she might be crazy enough to have more or in an unstable mental state and become quite combative.
In the video (from memory), the old lady put down her gun, but only after numerous commands to do so. With gun drawn, the officer advanced on her, giving her direction to get down on the ground, as apparently was policy. The old lady failed to comply and seemed confused by the officer advancing on her and seemed to side step away. Still being order down, she did not go. So the officer holstered his gun, grabbed her, brought her arms back, still repeating the command to get down. When the old lady would not go down, he put one leg out and used it to trip the old lady, taking her off balance, and then the officer basically controlled her decent and placed her on the ground. There was no granny-slamming. She was not harmed in the take down. I saw her in an interview after she bonded out and she stated she was not injured, but she also stated that she had no idea why she got her gun out and was threatening the parade participants with it other than the noise had upset her.
So basically, the old lady was apparently in a confused mental state at the time and as such, her lack of compliance to officer commands to get down were definitely a potential risk to the officer and bystanders. As she was apparently confused, there was no reason to believe that she would be fully compliant or docile and the officers could not ascertain if she had any other weapons until they searched her.
Never underestimate a threat. Yes, she was an old lady. Yes, she seemed frail. Yes, she pointed a loaded revolver at a crowd of people and threatened to kill them. Why would you NOT follow full dangerous felony procedures with the old lady? Why would you be so naive as to assume that she had only one weapon?
Every year, cops get killed when they are caught off guard by supposedly non-threatening individuals such as the elderly, women, or folks who appear to comply and then after having suckered officers into a false sense of security, attack.
If you don't like grannies being taken down by officers after they commit felonies with guns, then by golly don't give grannies guns.