I was doing a hike activity two days ago and, while waiting for the complete group, decided to test how incident detection works with Fenix6(i have tested several times with Edge830 but never had an activation on Fenix 6)
So, I moved very very fast my hand, nothing happened first but then, after 3-4 seconds, the incident detection screen was triggered.
I waited the countdown counter to go OFF and the location was sent to my emergency contact -> ALL GOOD
Then I had a screen to "send I'm OK, no help needed", Did that too - information was sent to my emergency contact -> ALL GOOD
The big surprise for me was - after incident detection activation and sending the messages - the active recording activity was stopped and saved. So i had to start a brand new activity for recording the rest of the trip.
It saved also an activity for this incident detected entry - https://connect.garmin.com/modern/activity/5051980859
So, if you are inside an activity, do not try to test incident detection just for fun :)))