No disrespect meant from this post just some history and comments.
Never being attacked by a handshake.
I have seen those try to crush people hands in "Friendly" Contests.
I have seen those who for security carry a batton on their side. Most are right handed. So they carry there on their right side.
I have even trained some of those who carry there but worked for others. They ask for the training in particular after I would be a jerk to them. I would walk up and shake their hand with my right. My Left would grab their batton in a reverse grip / ice pick manner and I would butt/punyo them in the short ribs. If they had some basic training on someone redirecting their right hand in a grip and or to counter from there they might have stood a chance. Instead after the quick Pop I let it fall back into the ring as it did not have to clear to get my strike. I then did a joint lock on them. If I can do it, then the bad guy can do it. I was reading on another forum yesterday where they linked in a third forum that was a white supremist forum and how they were looking for training in certain arts or weapons. I know what I consider the bad guys are looking and training. The security guards were not trained in weapon retention properly. They did not treat their batton like a firearm and how the police train to always keep it back and less available to be grabbed.