Trebuchet nutshot

This video was created about 5 yrs ago. We made a trebuchet, first test went well, so my brother decided to stand in front of it. I didnt pull the pin hard enough the second time, which shifted the arm and made the sling release early. Which resulted in a mis-fire, off the ceiling and redirected at his balls. As you can see wearing a helmet and goalie pads, wasnt as important as wearing a cup, which he was NOT wearing at the time.