A New York City firefighter was knocked out when a falling air conditioning unit struck him while out on a call. You can see in the video that the firefighter was walking on the property where the fire was taking place, when the falling A/C unit knocked him unconscious. A fellow firefighter can be heard yelling for a medic after he was struck.
This was all caught on a ring camera.
Here is the video:
Here’s a picture of the helmet… This thing really did its job.