This is a bird called the Sereima, and what you are seeing isn’t random behavior: it’s how they hunt. They chase rodents and lizards down, grab them with their beaks, then slam their prey down onto rocks repeatedly until they stop moving.
Metal as hell.
The ball was red. The gender of the person was unspecified, they were just a hand coming into the scene coming out of a long sleeve green shirt. And the ball was like the size of a softball. What I pictured was a zoomed in part of a table, Brown, but with two zoomed in of perspective for me to know the shape of the whole table.