subtle incapacitation
It is quite clear that some people abovefail to understand that incapacitation can be quite subtle and as the result of a multitude of factors.
A few weeks back a co-worker was talking to me in a very logical way and less than two minuets later she fainted and could not walk unassited.
There are indications to the onset of this sort of incapacitation but the victim is always the last to know. Airline aproach callouts as well as challenge and responce monitoring during critical phases of flight are designed to alert crew members to subtle incapacitation.
Unfortunately this incapacitation monitoring is unavalable to single pilot operations.
A quick traul of the incapacitation numbers and you will find that it is not the major killers that result in most incapacitations, it is the humble food poisoning that stops most pilots from functioning fully.