The gasp reflex can be deadly and that is, indeed, not a minor point...but neither is it a universal reaction. All of the physiological reactions discussed in the video ARE universal and every one of those volunteers would have died very quickly in that water without, at minimum, a PFD. Let's remember that none of the volunteers gasped, while submerged, and filled their lungs with water. (to be very clear...I'm not saying it doesn't happen but it isn't universal). This was not a cold water kayaking video nor was it a comprehensive survival guide. It was a 10 minute video clip that demonstrated what happens when someone not dressed for immersion winds up in cold water and the huge benefit that a PFD can provide.