[TurboZamboni]

Grabbing a cop’s gun is generally an an attempt of trying to stop being an “unarmed man”.

It generally leads to becoming a “dead man”.

[KeyLargo]

Officer Wilson testyfied that the Gentle Giant grabbed his semi-auto by the barrel which prevented the slide from moving into battery. That technique is learned in prisons and taught by ex-cons to other thugs on the street on the disarming of police officers.

"Any grappling over a semi-automatic is likely to push the slide out of battery. If the slide is out of battery, the gun won’t fire. Alternatively, the aggressors hand could lap over the rear of the slide in such a way as to prevent the fall of the hammer (the pistol in question, a Sig 299, employs a hammer to strike a firing pin). If the hammer is blocked, it cannot impact the firing pin, the firing pin cannot impact the primer, and “CLICK.”

The above applies to ALL shots, whether first or successive. But ALSO in the context of successive shots, if an aggressors hand is over the slide, but not pushing it out of battery, the gun may fire the first round. But with the aggressor’s hand blocking the ejection port, the just-fired round cannot eject, and a new round is not loaded. Therefore the gun won’t fire a successive round until the slide is manually cycled, allowing the fired brass to be ejected, and a new fresh round to be chambered."

Sounds like Wilson encountered both of these scenarios." –Andrew, @LawSelfDefense

Comments section: http://legalinsurrection.com/2014/11/ferguson-grand-jury-police-officers-account-of-shooting/