I posted this one on our FB page awhile ago. It was to demonstrate that even during an all out fist fight in the free-standing or kickboxing range, someone can pull a weapon out such as a gun, especially if they feel they are on the losing end of an altercation or exchange.
Burton does a great job breaking this one down and explains how to properly address a gun disarm. There are no guarantees, but knowing is always better than not knowing. So study on this.