A slingshot. Hmm. That explains a number of things to me now. First off, it is cowardly as well as harmful to people. Secondarily? During the SF "shutdown" -- soon after, there was another protest at the Oakland docks. Some protestors claimed to have been hit by pellets "or something". I'll bet you dollars to donuts, protestors were hit by "things" shot at them with slingshots -- by those wishing to "agitate" at any price, including harm to allied protestors. Just to make a point. These folks are anti-humanity.
I searched hard for more data about those who had been hit. Nada. The left would claim the "nada" was due to "silencing and oppression by the brutal opposition"; however, could it be that no one *really* could figure out How these people got hurt? (except those who used slingshots....)
Oh, just a notion. But quite a solid one, given that Molotov cocktails were found after the protests in SF.
During the SF protects the SFPD were equipped with a non-lethal "super-sock" bean bag, the gun holds 10 shots. It was not used for crowd control but for officer protection only. At SF, the protectors did also use sling-shots and anything else they could throw. I remember the oakland protests and the "cry-babies" that were screaming police brutality, I'm not sure if the bean bags were used their are not but if they were it would definitely leave its mark on ya :)