Only if you are pushing boundaries of the performance of the helicopter. Yes, they are designed with a specific balance in mind, but that balance is an envelope not a single number. They need to have capability to add people as well as have those people move around in flight. Some are designed to carry payloads/cargo, too, which can be variable in weight and shape. Have you ever seen a rescue helicopter flying with a gurney dangling by a line, swinging in the wind with a patient strapped to it? Same thing.
I had a whole animal based joke playing out with bird fish seal, but I couldn't find an animal term for an army person. I thought about saying seal but couldn't tell what kind of military person it was sliding down the line.
