The trigger finger release is placed ABOVE the trigger along the slide, not over it. I like this guy and give him props for putting this out there. Glad he can see this was not a holster issue, it was a having-your-trigger-finger-where-it-shouldn't-be problem. That said, glad he's ok.
Believe it or not, some moron posted this video as "ND caused by a Serpa Holster!" He suffered from some pee poor trigger finger (and safety) discipline to cause this, but I am glad he's okay. I also have a strong feeling that he'll exercise proper safety from now on.