Involuntary immersion is never a good day, but can go from bad to worse based on the individuals training and preparation, and it's currency. Very few know of the 1-10-1 rule, depending on the "system" to keep them safe, or if not, to rescue them, without disturbing their "normal" and blissful ignorance too much. Problem is, most times, the system won't be there in time to save them.