Helicopter down in East River, NYC

[DroneDog]

Flyting posted a customer video earlier.

There it is, look at the harness buckle, it's a simple clasp affair. But if you are hanging from this your full bodyweight pressed against the front clasp, it will make it incredibly difficult if not impossible to undo.
Indeed perhaps why it was chosen, if an inexperienced operative fell out whilst in flight and panicked there is no way they could accidentally open the harness.

EDIT: What would be the topic of discussion if a photographer had fallen out in flight and was suspended by his tether with a quick release mechanism and then he accidentally activated the quick release harness?

The harnesses I have used in the past are two-step device plug two separate levers affair and your out.