The tracksuit and matching Adidas sneakers are kind of a give-away. Anyone can buy a hi-vis vest. No way a security guard or worker would be dressed like that to do any real work up there. And absolutely no way they would risk their life or their job to stop some nutter getting their Darwin award. Even if successful, they’d be fired for exposing the company to liability. They’d just wait by the door and have them trespassed on their way out.