Back in the late 1800's, a rail road section boss in colorado was attacked by a grizzly bear, while he was walking his section.
He KILLED the griz with thrown rocks, AND was uninjured.
He was a pitcher for either the company or town, forget which, baseball team.
Yes, in the right hands, rocks are deadly.
I know a couple of "town" pitchers that I would never walk in front of....
;-)