"Only known trebuchet casualty" - also known as "the guy who had the worst luck in 14th century Scotland." Imagine surviving the siege, then taking a 90kg rock to the back at 300km/h. At least it was quick
Trebuchet were used primarily to hammer the walls of the castle to break them down. Not really possible to aim at a person; the soldiers clambering over the broken walls will do that.
This is the only man known to have died in a medieval siege of a medium-sized boulder falling on him.
Trebuchets were used for a variety of purposes in siege warfare, from (uniquely) breaching walls with large boulders to (less uniquely) setting things on fire to (probably) suppressing massed formations of archers with smaller shot. But smaller shot would not leave a characteristic trebuchet injury, it would leave a generic blunt-force trauma injury.
It's pretty clear he didn't pull that off...
There have been some serious injuries, too:
https://www.oregonlive.com/washingtoncounty/2006/10/child_tv...
Trebuchets were used for a variety of purposes in siege warfare, from (uniquely) breaching walls with large boulders to (less uniquely) setting things on fire to (probably) suppressing massed formations of archers with smaller shot. But smaller shot would not leave a characteristic trebuchet injury, it would leave a generic blunt-force trauma injury.