I disagree. When Apple Watch detects an event that it considers as a fall, it asks the wearer if he/she is ok. Failure to respond then triggers the 911 call. So being unconscious had a lot to do with it.

It also requires them click "i'm ok" if when it detects the fall, so if the person is not unconscious they can click that to stop the emergency call.

It automatically calls if the wearer doesn't move for a minute after the fall.