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I don't read that the same way many people here do which seems to be:
1) MOF is the only sign of distress;
2) MOF is a foolproof sign of distress;
3) MOF is a required technique to communicate that you are in distress.
I also think people with MOF are ones that still haven't lost a mask in surf, accidental bumping, etc. But they probably will. Or someone they teach will. Or someone who copies them.
...Panicked divers These are divers with a problem who have become overwhelmed by stress and unreasoned fear. Theyve abandoned rational responses and react entirely through instinct and fear.
Generally, panicked divers:
Reject their equipment (mask on forehead, regulator and snorkel out of mouth).
They will reject gear but this should not be a primary characteristic to be looking for in a panicked diver and i have never seen a panicked diver reject their mask by placing it on their forehead. It may end up there but not to be confused with placing it there.
Fail to establish buoyancy and swim vigorously with arms until exhausted.
The "swim" part is misleading. A panicked diver will generally press down at their sides or in the front in an attempt to keep the head/airway above water.
Do not respond to commands or questions.
This is correct.
Fixate on a single, ineffective response to the problem.
That single response revolves around maintaining the head and airway above water and not resolving the problem with, ie. maintaining buoyancy.
Will climb on anything or anyone to get above or out of the water.
Panicked diver will take whatever breaths they can get at your expense.
Will do little to help themselves.
Correct.
Good question. A lifeguard is trained to identify physical characteristics that indicate a person is either in distress or actively drowning. A mask situated on the forehead is not a primary indicator of either one that a lifeguard should be looking for. If it is something they're looking for then it is due to the widespread notion that the MOF is an indicator but a trained lifeguard should know better. They are more apt to focus on the characteristics of breathing, arm & leg action, body position and locomotion.
This MOF thing is just silly, do I look in need of assistance?