Two videos have emerged from the Antifa protests of Antifa using bike l9ks on the end of chains as impact weapons like a medieval mace.   They are easy to conceal, hit hard, and don’t attract as much attention as a stick.

https://m.youtube.com/watch?v=BGBathFnjMc

And

That whack to the head sounded hard.  The guy was bleeding badly within seconds.   I wouldn’t have been surprised if he had a skull fracture.  That is potentially lethal.

I don’t go to protests. 

If you do, think about wearing a helmet.   A good DOT approved three-quarter motorcycle helmet would be my recommendation.

Helmeted or not, protest or parking lot confrontation over a door ding, DISTANCE IS YOUR FRIEND.   Don’t let someone that angry at you close enough to you.  The more distance they have to close before touching you, the more time you have to react.

Also, if somebody ever tried to hit me with s bike lock, I’m going to shoot them in the liver.  This is why I don’t go to protests, you can’t carry at them.